/*----------------------------------------------------------------------------/
/  FatFs - Generic FAT Filesystem Module  R0.13a                              /
/-----------------------------------------------------------------------------/
/
/ Copyright (C) 2017, ChaN, all right reserved.
/
/ FatFs module is an open source software. Redistribution and use of FatFs in
/ source and binary forms, with or without modification, are permitted provided
/ that the following condition is met:
/
/ 1. Redistributions of source code must retain the above copyright notice,
/    this condition and the following disclaimer.
/
/ This software is provided by the copyright holder and contributors "AS IS"
/ and any warranties related to this software are DISCLAIMED.
/ The copyright owner or contributors be NOT LIABLE for any damages caused
/ by use of this software.
/
/----------------------------------------------------------------------------*/


#include "ff.h"			/* Declarations of FatFs API */
#include "diskio.h"		/* Declarations of device I/O functions */


/*--------------------------------------------------------------------------

Module Private Definitions

---------------------------------------------------------------------------*/

#if FF_DEFINED != 89352	/* Revision ID */
#error Wrong include file (ff.h).
#endif


/* Character code support macros */
#define IsUpper(c)		((c) >= 'A' && (c) <= 'Z')
#define IsLower(c)		((c) >= 'a' && (c) <= 'z')
#define IsDigit(c)		((c) >= '0' && (c) <= '9')
#define IsSurrogate(c)	((c) >= 0xD800 && (c) <= 0xDFFF)
#define IsSurrogateH(c)	((c) >= 0xD800 && (c) <= 0xDBFF)
#define IsSurrogateL(c)	((c) >= 0xDC00 && (c) <= 0xDFFF)


/* Additional file attribute bits for internal use */
#define AM_VOL		0x08	/* Volume label */
#define AM_LFN		0x0F	/* LFN entry */
#define AM_MASK		0x3F	/* Mask of defined bits */


/* Additional file access control and file status flags for internal use */
#define FA_SEEKEND	0x20	/* Seek to end of the file on file open */
#define FA_MODIFIED	0x40	/* File has been modified */
#define FA_DIRTY	0x80	/* FIL.buf[] needs to be written-back */


/* Name status flags in fn[11] */
#define NSFLAG		11		/* Index of the name status byte */
#define NS_LOSS		0x01	/* Out of 8.3 format */
#define NS_LFN		0x02	/* Force to create LFN entry */
#define NS_LAST		0x04	/* Last segment */
#define NS_BODY		0x08	/* Lower case flag (body) */
#define NS_EXT		0x10	/* Lower case flag (ext) */
#define NS_DOT		0x20	/* Dot entry */
#define NS_NOLFN	0x40	/* Do not find LFN */
#define NS_NONAME	0x80	/* Not followed */


/* Limits and boundaries */
#define MAX_DIR		0x200000		/* Max size of FAT directory */
#define MAX_DIR_EX	0x10000000		/* Max size of exFAT directory */
#define MAX_FAT12	0xFF5			/* Max FAT12 clusters (differs from specs, but right for real DOS/Windows behavior) */
#define MAX_FAT16	0xFFF5			/* Max FAT16 clusters (differs from specs, but right for real DOS/Windows behavior) */
#define MAX_FAT32	0x0FFFFFF5		/* Max FAT32 clusters (not specified, practical limit) */
#define MAX_EXFAT	0x7FFFFFFD		/* Max exFAT clusters (differs from specs, implementation limit) */


/* FatFs refers the FAT structure as simple byte array instead of structure member
/ because the C structure is not binary compatible between different platforms */

#define BS_JmpBoot			0		/* x86 jump instruction (3-byte) */
#define BS_OEMName			3		/* OEM name (8-byte) */
#define BPB_BytsPerSec		11		/* Sector size [byte] (WORD) */
#define BPB_SecPerClus		13		/* Cluster size [sector] (BYTE) */
#define BPB_RsvdSecCnt		14		/* Size of reserved area [sector] (WORD) */
#define BPB_NumFATs			16		/* Number of FATs (BYTE) */
#define BPB_RootEntCnt		17		/* Size of root directory area for FAT [entry] (WORD) */
#define BPB_TotSec16		19		/* Volume size (16-bit) [sector] (WORD) */
#define BPB_Media			21		/* Media descriptor byte (BYTE) */
#define BPB_FATSz16			22		/* FAT size (16-bit) [sector] (WORD) */
#define BPB_SecPerTrk		24		/* Number of sectors per track for int13h [sector] (WORD) */
#define BPB_NumHeads		26		/* Number of heads for int13h (WORD) */
#define BPB_HiddSec			28		/* Volume offset from top of the drive (DWORD) */
#define BPB_TotSec32		32		/* Volume size (32-bit) [sector] (DWORD) */
#define BS_DrvNum			36		/* Physical drive number for int13h (BYTE) */
#define BS_NTres			37		/* WindowsNT error flag (BYTE) */
#define BS_BootSig			38		/* Extended boot signature (BYTE) */
#define BS_VolID			39		/* Volume serial number (DWORD) */
#define BS_VolLab			43		/* Volume label string (8-byte) */
#define BS_FilSysType		54		/* Filesystem type string (8-byte) */
#define BS_BootCode			62		/* Boot code (448-byte) */
#define BS_55AA				510		/* Signature word (WORD) */

#define BPB_FATSz32			36		/* FAT32: FAT size [sector] (DWORD) */
#define BPB_ExtFlags32		40		/* FAT32: Extended flags (WORD) */
#define BPB_FSVer32			42		/* FAT32: Filesystem version (WORD) */
#define BPB_RootClus32		44		/* FAT32: Root directory cluster (DWORD) */
#define BPB_FSInfo32		48		/* FAT32: Offset of FSINFO sector (WORD) */
#define BPB_BkBootSec32		50		/* FAT32: Offset of backup boot sector (WORD) */
#define BS_DrvNum32			64		/* FAT32: Physical drive number for int13h (BYTE) */
#define BS_NTres32			65		/* FAT32: Error flag (BYTE) */
#define BS_BootSig32		66		/* FAT32: Extended boot signature (BYTE) */
#define BS_VolID32			67		/* FAT32: Volume serial number (DWORD) */
#define BS_VolLab32			71		/* FAT32: Volume label string (8-byte) */
#define BS_FilSysType32		82		/* FAT32: Filesystem type string (8-byte) */
#define BS_BootCode32		90		/* FAT32: Boot code (420-byte) */

#define BPB_ZeroedEx		11		/* exFAT: MBZ field (53-byte) */
#define BPB_VolOfsEx		64		/* exFAT: Volume offset from top of the drive [sector] (QWORD) */
#define BPB_TotSecEx		72		/* exFAT: Volume size [sector] (QWORD) */
#define BPB_FatOfsEx		80		/* exFAT: FAT offset from top of the volume [sector] (DWORD) */
#define BPB_FatSzEx			84		/* exFAT: FAT size [sector] (DWORD) */
#define BPB_DataOfsEx		88		/* exFAT: Data offset from top of the volume [sector] (DWORD) */
#define BPB_NumClusEx		92		/* exFAT: Number of clusters (DWORD) */
#define BPB_RootClusEx		96		/* exFAT: Root directory start cluster (DWORD) */
#define BPB_VolIDEx			100		/* exFAT: Volume serial number (DWORD) */
#define BPB_FSVerEx			104		/* exFAT: Filesystem version (WORD) */
#define BPB_VolFlagEx		106		/* exFAT: Volume flags (WORD) */
#define BPB_BytsPerSecEx	108		/* exFAT: Log2 of sector size in unit of byte (BYTE) */
#define BPB_SecPerClusEx	109		/* exFAT: Log2 of cluster size in unit of sector (BYTE) */
#define BPB_NumFATsEx		110		/* exFAT: Number of FATs (BYTE) */
#define BPB_DrvNumEx		111		/* exFAT: Physical drive number for int13h (BYTE) */
#define BPB_PercInUseEx		112		/* exFAT: Percent in use (BYTE) */
#define BPB_RsvdEx			113		/* exFAT: Reserved (7-byte) */
#define BS_BootCodeEx		120		/* exFAT: Boot code (390-byte) */

#define DIR_Name			0		/* Short file name (11-byte) */
#define DIR_Attr			11		/* Attribute (BYTE) */
#define DIR_NTres			12		/* Lower case flag (BYTE) */
#define DIR_CrtTime10		13		/* Created time sub-second (BYTE) */
#define DIR_CrtTime			14		/* Created time (DWORD) */
#define DIR_LstAccDate		18		/* Last accessed date (WORD) */
#define DIR_FstClusHI		20		/* Higher 16-bit of first cluster (WORD) */
#define DIR_ModTime			22		/* Modified time (DWORD) */
#define DIR_FstClusLO		26		/* Lower 16-bit of first cluster (WORD) */
#define DIR_FileSize		28		/* File size (DWORD) */
#define LDIR_Ord			0		/* LFN: LFN order and LLE flag (BYTE) */
#define LDIR_Attr			11		/* LFN: LFN attribute (BYTE) */
#define LDIR_Type			12		/* LFN: Entry type (BYTE) */
#define LDIR_Chksum			13		/* LFN: Checksum of the SFN (BYTE) */
#define LDIR_FstClusLO		26		/* LFN: MBZ field (WORD) */
#define XDIR_Type			0		/* exFAT: Type of exFAT directory entry (BYTE) */
#define XDIR_NumLabel		1		/* exFAT: Number of volume label characters (BYTE) */
#define XDIR_Label			2		/* exFAT: Volume label (11-WORD) */
#define XDIR_CaseSum		4		/* exFAT: Sum of case conversion table (DWORD) */
#define XDIR_NumSec			1		/* exFAT: Number of secondary entries (BYTE) */
#define XDIR_SetSum			2		/* exFAT: Sum of the set of directory entries (WORD) */
#define XDIR_Attr			4		/* exFAT: File attribute (WORD) */
#define XDIR_CrtTime		8		/* exFAT: Created time (DWORD) */
#define XDIR_ModTime		12		/* exFAT: Modified time (DWORD) */
#define XDIR_AccTime		16		/* exFAT: Last accessed time (DWORD) */
#define XDIR_CrtTime10		20		/* exFAT: Created time subsecond (BYTE) */
#define XDIR_ModTime10		21		/* exFAT: Modified time subsecond (BYTE) */
#define XDIR_CrtTZ			22		/* exFAT: Created timezone (BYTE) */
#define XDIR_ModTZ			23		/* exFAT: Modified timezone (BYTE) */
#define XDIR_AccTZ			24		/* exFAT: Last accessed timezone (BYTE) */
#define XDIR_GenFlags		33		/* exFAT: General secondary flags (BYTE) */
#define XDIR_NumName		35		/* exFAT: Number of file name characters (BYTE) */
#define XDIR_NameHash		36		/* exFAT: Hash of file name (WORD) */
#define XDIR_ValidFileSize	40		/* exFAT: Valid file size (QWORD) */
#define XDIR_FstClus		52		/* exFAT: First cluster of the file data (DWORD) */
#define XDIR_FileSize		56		/* exFAT: File/Directory size (QWORD) */

#define SZDIRE				32		/* Size of a directory entry */
#define DDEM				0xE5	/* Deleted directory entry mark set to DIR_Name[0] */
#define RDDEM				0x05	/* Replacement of the character collides with DDEM */
#define LLEF				0x40	/* Last long entry flag in LDIR_Ord */

#define FSI_LeadSig			0		/* FAT32 FSI: Leading signature (DWORD) */
#define FSI_StrucSig		484		/* FAT32 FSI: Structure signature (DWORD) */
#define FSI_Free_Count		488		/* FAT32 FSI: Number of free clusters (DWORD) */
#define FSI_Nxt_Free		492		/* FAT32 FSI: Last allocated cluster (DWORD) */

#define MBR_Table			446		/* MBR: Offset of partition table in the MBR */
#define SZ_PTE				16		/* MBR: Size of a partition table entry */
#define PTE_Boot			0		/* MBR PTE: Boot indicator */
#define PTE_StHead			1		/* MBR PTE: Start head */
#define PTE_StSec			2		/* MBR PTE: Start sector */
#define PTE_StCyl			3		/* MBR PTE: Start cylinder */
#define PTE_System			4		/* MBR PTE: System ID */
#define PTE_EdHead			5		/* MBR PTE: End head */
#define PTE_EdSec			6		/* MBR PTE: End sector */
#define PTE_EdCyl			7		/* MBR PTE: End cylinder */
#define PTE_StLba			8		/* MBR PTE: Start in LBA */
#define PTE_SizLba			12		/* MBR PTE: Size in LBA */


/* Post process on fatal error in the file operations */
#define ABORT(fs, res)		{ fp->err = (BYTE)(res); LEAVE_FF(fs, res); }


/* Re-entrancy related */
#if FF_FS_REENTRANT
#if FF_USE_LFN == 1
#error Static LFN work area cannot be used at thread-safe configuration
#endif
#define LEAVE_FF(fs, res)	{ unlock_fs(fs, res); return res; }
#else
#define LEAVE_FF(fs, res)	return res
#endif


/* Definitions of volume - physical location conversion */
#if FF_MULTI_PARTITION
#define LD2PD(vol) VolToPart[vol].pd	/* Get physical drive number */
#define LD2PT(vol) VolToPart[vol].pt	/* Get partition index */
#else
#define LD2PD(vol) (BYTE)(vol)	/* Each logical drive is bound to the same physical drive number */
#define LD2PT(vol) 0			/* Find first valid partition or in SFD */
#endif


/* Definitions of sector size */
#if (FF_MAX_SS < FF_MIN_SS) || (FF_MAX_SS != 512 && FF_MAX_SS != 1024 && FF_MAX_SS != 2048 && FF_MAX_SS != 4096) || (FF_MIN_SS != 512 && FF_MIN_SS != 1024 && FF_MIN_SS != 2048 && FF_MIN_SS != 4096)
#error Wrong sector size configuration
#endif
#if FF_MAX_SS == FF_MIN_SS
#define SS(fs)	((UINT)FF_MAX_SS)	/* Fixed sector size */
#else
#define SS(fs)	((fs)->ssize)	/* Variable sector size */
#endif


/* Timestamp */
#if FF_FS_NORTC == 1
#if FF_NORTC_YEAR < 1980 || FF_NORTC_YEAR > 2107 || FF_NORTC_MON < 1 || FF_NORTC_MON > 12 || FF_NORTC_MDAY < 1 || FF_NORTC_MDAY > 31
#error Invalid FF_FS_NORTC settings
#endif
#define GET_FATTIME()	((DWORD)(FF_NORTC_YEAR - 1980) << 25 | (DWORD)FF_NORTC_MON << 21 | (DWORD)FF_NORTC_MDAY << 16)
#else
#define GET_FATTIME()	get_fattime()
#endif


/* File lock controls */
#if FF_FS_LOCK != 0
#if FF_FS_READONLY
#error FF_FS_LOCK must be 0 at read-only configuration
#endif
typedef struct {
  FATFS *fs;		/* Object ID 1, volume (NULL:blank entry) */
  DWORD clu;		/* Object ID 2, containing directory (0:root) */
  DWORD ofs;		/* Object ID 3, offset in the directory */
  WORD ctr;		/* Object open counter, 0:none, 0x01..0xFF:read mode open count, 0x100:write mode */
} FILESEM;
#endif


/* SBCS up-case tables (\x80-\xFF) */
#define TBL_CT437  {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
          0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
            0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT720  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
          0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
            0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT737  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
0x90,0x92,0x92,0x93,0x94,0x95,0x96,0x97,0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87, \
  0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0xAA,0x92,0x93,0x94,0x95,0x96, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
          0x97,0xEA,0xEB,0xEC,0xE4,0xED,0xEE,0xEF,0xF5,0xF0,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
            0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT771  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDC,0xDE,0xDE, \
          0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
            0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFE,0xFF}
#define TBL_CT775  {0x80,0x9A,0x91,0xA0,0x8E,0x95,0x8F,0x80,0xAD,0xED,0x8A,0x8A,0xA1,0x8D,0x8E,0x8F, \
0x90,0x92,0x92,0xE2,0x99,0x95,0x96,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
  0xA0,0xA1,0xE0,0xA3,0xA3,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xA5,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
          0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE3,0xE8,0xE8,0xEA,0xEA,0xEE,0xED,0xEE,0xEF, \
            0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT850  {0x43,0x55,0x45,0x41,0x41,0x41,0x41,0x43,0x45,0x45,0x45,0x49,0x49,0x49,0x41,0x41, \
0x45,0x92,0x92,0x4F,0x4F,0x4F,0x55,0x55,0x59,0x4F,0x55,0x4F,0x9C,0x4F,0x9E,0x9F, \
  0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0x41,0x41,0x41,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0x41,0x41,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD1,0xD1,0x45,0x45,0x45,0x49,0x49,0x49,0x49,0xD9,0xDA,0xDB,0xDC,0xDD,0x49,0xDF, \
          0x4F,0xE1,0x4F,0x4F,0x4F,0x4F,0xE6,0xE8,0xE8,0x55,0x55,0x55,0x59,0x59,0xEE,0xEF, \
            0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT852  {0x80,0x9A,0x90,0xB6,0x8E,0xDE,0x8F,0x80,0x9D,0xD3,0x8A,0x8A,0xD7,0x8D,0x8E,0x8F, \
0x90,0x91,0x91,0xE2,0x99,0x95,0x95,0x97,0x97,0x99,0x9A,0x9B,0x9B,0x9D,0x9E,0xAC, \
  0xB5,0xD6,0xE0,0xE9,0xA4,0xA4,0xA6,0xA6,0xA8,0xA8,0xAA,0x8D,0xAC,0xB8,0xAE,0xAF, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBD,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC6,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD1,0xD1,0xD2,0xD3,0xD2,0xD5,0xD6,0xD7,0xB7,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
          0xE0,0xE1,0xE2,0xE3,0xE3,0xD5,0xE6,0xE6,0xE8,0xE9,0xE8,0xEB,0xED,0xED,0xDD,0xEF, \
            0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xEB,0xFC,0xFC,0xFE,0xFF}
#define TBL_CT855  {0x81,0x81,0x83,0x83,0x85,0x85,0x87,0x87,0x89,0x89,0x8B,0x8B,0x8D,0x8D,0x8F,0x8F, \
0x91,0x91,0x93,0x93,0x95,0x95,0x97,0x97,0x99,0x99,0x9B,0x9B,0x9D,0x9D,0x9F,0x9F, \
  0xA1,0xA1,0xA3,0xA3,0xA5,0xA5,0xA7,0xA7,0xA9,0xA9,0xAB,0xAB,0xAD,0xAD,0xAE,0xAF, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB6,0xB6,0xB8,0xB8,0xB9,0xBA,0xBB,0xBC,0xBE,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD1,0xD1,0xD3,0xD3,0xD5,0xD5,0xD7,0xD7,0xDD,0xD9,0xDA,0xDB,0xDC,0xDD,0xE0,0xDF, \
          0xE0,0xE2,0xE2,0xE4,0xE4,0xE6,0xE6,0xE8,0xE8,0xEA,0xEA,0xEC,0xEC,0xEE,0xEE,0xEF, \
            0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT857  {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0x49,0x8E,0x8F, \
0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x98,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9E, \
  0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA6,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD0,0xD1,0xD2,0xD3,0xD4,0x49,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
          0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xDE,0xED,0xEE,0xEF, \
            0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT860  {0x80,0x9A,0x90,0x8F,0x8E,0x91,0x86,0x80,0x89,0x89,0x92,0x8B,0x8C,0x98,0x8E,0x8F, \
0x90,0x91,0x92,0x8C,0x99,0xA9,0x96,0x9D,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  0x86,0x8B,0x9F,0x96,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
          0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
            0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT861  {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x8B,0x8B,0x8D,0x8E,0x8F, \
0x90,0x92,0x92,0x4F,0x99,0x8D,0x55,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
  0xA4,0xA5,0xA6,0xA7,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
          0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
            0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT862  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
          0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
            0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT863  {0x43,0x55,0x45,0x41,0x41,0x41,0x86,0x43,0x45,0x45,0x45,0x49,0x49,0x8D,0x41,0x8F, \
0x45,0x45,0x45,0x4F,0x45,0x49,0x55,0x55,0x98,0x4F,0x55,0x9B,0x9C,0x55,0x55,0x9F, \
  0xA0,0xA1,0x4F,0x55,0xA4,0xA5,0xA6,0xA7,0x49,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
          0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
            0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT864  {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
          0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
            0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT865  {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
          0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
            0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT866  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
          0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
            0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT869  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x86,0x9C,0x8D,0x8F,0x90, \
  0x91,0x90,0x92,0x95,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
        0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xA4,0xA5,0xA6,0xD9,0xDA,0xDB,0xDC,0xA7,0xA8,0xDF, \
          0xA9,0xAA,0xAC,0xAD,0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xCF,0xCF,0xD0,0xEF, \
            0xF0,0xF1,0xD1,0xD2,0xD3,0xF5,0xD4,0xF7,0xF8,0xF9,0xD5,0x96,0x95,0x98,0xFE,0xFF}


/* DBCS code range |----- 1st byte -----|  |----------- 2nd byte -----------| */
#define TBL_DC932 {0x81, 0x9F, 0xE0, 0xFC, 0x40, 0x7E, 0x80, 0xFC, 0x00, 0x00}
#define TBL_DC936 {0x81, 0xFE, 0x00, 0x00, 0x40, 0x7E, 0x80, 0xFE, 0x00, 0x00}
#define TBL_DC949 {0x81, 0xFE, 0x00, 0x00, 0x41, 0x5A, 0x61, 0x7A, 0x81, 0xFE}
#define TBL_DC950 {0x81, 0xFE, 0x00, 0x00, 0x40, 0x7E, 0xA1, 0xFE, 0x00, 0x00}


/* Macros for table definitions */
#define MERGE_2STR(a, b) a ## b
#define MKCVTBL(hd, cp) MERGE_2STR(hd, cp)




/*--------------------------------------------------------------------------

Module Private Work Area

---------------------------------------------------------------------------*/
/* Remark: Variables defined here without initial value shall be guaranteed
/  zero/null at start-up. If not, the linker option or start-up routine is
/  not compliance with C standard. */

/*--------------------------------*/
/* File/Volume controls           */
/*--------------------------------*/

#if FF_VOLUMES < 1 || FF_VOLUMES > 10
#error Wrong FF_VOLUMES setting
#endif
static FATFS *FatFs[FF_VOLUMES];	/* Pointer to the filesystem objects (logical drives) */
static WORD Fsid;					/* File system mount ID */

#if FF_FS_RPATH != 0 && FF_VOLUMES >= 2
static BYTE CurrVol;				/* Current drive */
#endif

#if FF_FS_LOCK != 0
static FILESEM Files[FF_FS_LOCK];	/* Open object lock semaphores */
#endif



/*--------------------------------*/
/* LFN/Directory working buffer   */
/*--------------------------------*/

#if FF_USE_LFN == 0		/* Non-LFN configuration */
#if FF_FS_EXFAT
#error LFN must be enabled when enable exFAT
#endif
#define DEF_NAMBUF
#define INIT_NAMBUF(fs)
#define FREE_NAMBUF()
#define LEAVE_MKFS(res)	return res

#else					/* LFN configurations */
#if FF_MAX_LFN < 12 || FF_MAX_LFN > 255
#error Wrong setting of FF_MAX_LFN
#endif
#if FF_LFN_BUF < 12 || FF_SFN_BUF < 12 || FF_LFN_BUF < FF_SFN_BUF
#error Wrong setting of FF_LFN_BUF or FF_SFN_BUF
#endif
#if FF_LFN_UNICODE < 0 || FF_LFN_UNICODE > 2
#error Wrong setting of FF_LFN_UNICODE
#endif
static const BYTE LfnOfs[] = {1,3,5,7,9,14,16,18,20,22,24,28,30};	/* FAT: Offset of LFN characters in the directory entry */
#define MAXDIRB(nc)	((nc + 44U) / 15 * SZDIRE)	/* exFAT: Size of directory entry block scratchpad buffer needed for the name length */

#if FF_USE_LFN == 1		/* LFN enabled with static working buffer */
#if FF_FS_EXFAT
static BYTE	DirBuf[MAXDIRB(FF_MAX_LFN)];	/* Directory entry block scratchpad buffer */
#endif
static WCHAR LfnBuf[FF_MAX_LFN + 1];		/* LFN working buffer */
#define DEF_NAMBUF
#define INIT_NAMBUF(fs)
#define FREE_NAMBUF()
#define LEAVE_MKFS(res)	return res

#elif FF_USE_LFN == 2 	/* LFN enabled with dynamic working buffer on the stack */
#if FF_FS_EXFAT
#define DEF_NAMBUF		WCHAR lbuf[FF_MAX_LFN+1]; BYTE dbuf[MAXDIRB(FF_MAX_LFN)];	/* LFN working buffer and directory entry block scratchpad buffer */
#define INIT_NAMBUF(fs)	{ (fs)->lfnbuf = lbuf; (fs)->dirbuf = dbuf; }
#define FREE_NAMBUF()
#else
#define DEF_NAMBUF		WCHAR lbuf[FF_MAX_LFN+1];	/* LFN working buffer */
#define INIT_NAMBUF(fs)	{ (fs)->lfnbuf = lbuf; }
#define FREE_NAMBUF()
#endif
#define LEAVE_MKFS(res)	return res

#elif FF_USE_LFN == 3 	/* LFN enabled with dynamic working buffer on the heap */
#if FF_FS_EXFAT
#define DEF_NAMBUF		WCHAR *lfn;	/* Pointer to LFN working buffer and directory entry block scratchpad buffer */
#define INIT_NAMBUF(fs)	{ lfn = ff_memalloc((FF_MAX_LFN+1)*2 + MAXDIRB(FF_MAX_LFN)); if (!lfn) LEAVE_FF(fs, FR_NOT_ENOUGH_CORE); (fs)->lfnbuf = lfn; (fs)->dirbuf = (BYTE*)(lfn+FF_MAX_LFN+1); }
#define FREE_NAMBUF()	ff_memfree(lfn)
#else
#define DEF_NAMBUF		WCHAR *lfn;	/* Pointer to LFN working buffer */
#define INIT_NAMBUF(fs)	{ lfn = ff_memalloc((FF_MAX_LFN+1)*2); if (!lfn) LEAVE_FF(fs, FR_NOT_ENOUGH_CORE); (fs)->lfnbuf = lfn; }
#define FREE_NAMBUF()	ff_memfree(lfn)
#endif
#define LEAVE_MKFS(res)	{ if (!work) ff_memfree(buf); return res; }
#define MAX_MALLOC	0x8000

#else
#error Wrong setting of FF_USE_LFN

#endif	/* FF_USE_LFN == 1 */
#endif	/* FF_USE_LFN == 0 */



/*--------------------------------*/
/* Code conversion tables         */
/*--------------------------------*/

#if FF_CODE_PAGE == 0		/* Run-time code page configuration */
#define CODEPAGE CodePage
static WORD CodePage;	/* Current code page */
static const BYTE *ExCvt, *DbcTbl;	/* Pointer to current SBCS up-case table and DBCS code range table below */
static const BYTE Ct437[] = TBL_CT437;
static const BYTE Ct720[] = TBL_CT720;
static const BYTE Ct737[] = TBL_CT737;
static const BYTE Ct771[] = TBL_CT771;
static const BYTE Ct775[] = TBL_CT775;
static const BYTE Ct850[] = TBL_CT850;
static const BYTE Ct852[] = TBL_CT852;
static const BYTE Ct855[] = TBL_CT855;
static const BYTE Ct857[] = TBL_CT857;
static const BYTE Ct860[] = TBL_CT860;
static const BYTE Ct861[] = TBL_CT861;
static const BYTE Ct862[] = TBL_CT862;
static const BYTE Ct863[] = TBL_CT863;
static const BYTE Ct864[] = TBL_CT864;
static const BYTE Ct865[] = TBL_CT865;
static const BYTE Ct866[] = TBL_CT866;
static const BYTE Ct869[] = TBL_CT869;
static const BYTE Dc932[] = TBL_DC932;
static const BYTE Dc936[] = TBL_DC936;
static const BYTE Dc949[] = TBL_DC949;
static const BYTE Dc950[] = TBL_DC950;

#elif FF_CODE_PAGE < 900	/* Static code page configuration (SBCS) */
#define CODEPAGE FF_CODE_PAGE
static const BYTE ExCvt[] = MKCVTBL(TBL_CT, FF_CODE_PAGE);

#else					/* Static code page configuration (DBCS) */
#define CODEPAGE FF_CODE_PAGE
static const BYTE DbcTbl[] = MKCVTBL(TBL_DC, FF_CODE_PAGE);

#endif




/*--------------------------------------------------------------------------

Module Private Functions

---------------------------------------------------------------------------*/


/*-----------------------------------------------------------------------*/
/* Load/Store multi-byte word in the FAT structure                       */
/*-----------------------------------------------------------------------*/

static
WORD ld_word (const BYTE* ptr)	/*	 Load a 2-byte little-endian word */
{
  WORD rv;
  
  rv = ptr[1];
  rv = rv << 8 | ptr[0];
  return rv;
}

static
DWORD ld_dword (const BYTE* ptr)	/* Load a 4-byte little-endian word */
{
  DWORD rv;
  
  rv = ptr[3];
  rv = rv << 8 | ptr[2];
  rv = rv << 8 | ptr[1];
  rv = rv << 8 | ptr[0];
  return rv;
}

#if FF_FS_EXFAT
static
QWORD ld_qword (const BYTE* ptr)	/* Load an 8-byte little-endian word */
{
  QWORD rv;
  
  rv = ptr[7];
  rv = rv << 8 | ptr[6];
  rv = rv << 8 | ptr[5];
  rv = rv << 8 | ptr[4];
  rv = rv << 8 | ptr[3];
  rv = rv << 8 | ptr[2];
  rv = rv << 8 | ptr[1];
  rv = rv << 8 | ptr[0];
  return rv;
}
#endif

#if !FF_FS_READONLY
static
void st_word (BYTE* ptr, WORD val)	/* Store a 2-byte word in little-endian */
{
  *ptr++ = (BYTE)val; val >>= 8;
  *ptr++ = (BYTE)val;
}

static
void st_dword (BYTE* ptr, DWORD val)	/* Store a 4-byte word in little-endian */
{
  *ptr++ = (BYTE)val; val >>= 8;
  *ptr++ = (BYTE)val; val >>= 8;
  *ptr++ = (BYTE)val; val >>= 8;
  *ptr++ = (BYTE)val;
}

#if FF_FS_EXFAT
static
void st_qword (BYTE* ptr, QWORD val)	/* Store an 8-byte word in little-endian */
{
  *ptr++ = (BYTE)val; val >>= 8;
  *ptr++ = (BYTE)val; val >>= 8;
  *ptr++ = (BYTE)val; val >>= 8;
  *ptr++ = (BYTE)val; val >>= 8;
  *ptr++ = (BYTE)val; val >>= 8;
  *ptr++ = (BYTE)val; val >>= 8;
  *ptr++ = (BYTE)val; val >>= 8;
  *ptr++ = (BYTE)val;
}
#endif
#endif	/* !FF_FS_READONLY */



/*-----------------------------------------------------------------------*/
/* String functions                                                      */
/*-----------------------------------------------------------------------*/

/* Copy memory to memory */
static
void mem_cpy (void* dst, const void* src, UINT cnt)
{
  BYTE *d = (BYTE*)dst;
  const BYTE *s = (const BYTE*)src;
  
  if (cnt != 0) {
    do {
      *d++ = *s++;
    } while (--cnt);
  }
}


/* Fill memory block */
static
void mem_set (void* dst, int val, UINT cnt)
{
  BYTE *d = (BYTE*)dst;
  
  do {
    *d++ = (BYTE)val;
  } while (--cnt);
}


/* Compare memory block */
static
int mem_cmp (const void* dst, const void* src, UINT cnt)	/* ZR:same, NZ:different */
{
  const BYTE *d = (const BYTE *)dst, *s = (const BYTE *)src;
  int r = 0;
  
  do {
    r = *d++ - *s++;
  } while (--cnt && r == 0);
  
  return r;
}


/* Check if chr is contained in the string */
static
int chk_chr (const char* str, int chr)	/* NZ:contained, ZR:not contained */
{
  while (*str && *str != chr) str++;
  return *str;
}


/* Test if the character is DBC 1st byte */
static
int dbc_1st (BYTE c)
{
#if FF_CODE_PAGE == 0		/* Variable code page */
  if (DbcTbl && c >= DbcTbl[0]) {
    if (c <= DbcTbl[1]) return 1;					/* 1st byte range 1 */
    if (c >= DbcTbl[2] && c <= DbcTbl[3]) return 1;	/* 1st byte range 2 */
  }
#elif FF_CODE_PAGE >= 900	/* DBCS fixed code page */
  if (c >= DbcTbl[0]) {
    if (c <= DbcTbl[1]) return 1;
    if (c >= DbcTbl[2] && c <= DbcTbl[3]) return 1;
  }
#else						/* SBCS fixed code page */
  if (c != 0) return 0;	/* Always false */
#endif
  return 0;
}


/* Test if the character is DBC 2nd byte */
static
int dbc_2nd (BYTE c)
{
#if FF_CODE_PAGE == 0		/* Variable code page */
  if (DbcTbl && c >= DbcTbl[4]) {
    if (c <= DbcTbl[5]) return 1;					/* 2nd byte range 1 */
    if (c >= DbcTbl[6] && c <= DbcTbl[7]) return 1;	/* 2nd byte range 2 */
    if (c >= DbcTbl[8] && c <= DbcTbl[9]) return 1;	/* 2nd byte range 3 */
  }
#elif FF_CODE_PAGE >= 900	/* DBCS fixed code page */
  if (c >= DbcTbl[4]) {
    if (c <= DbcTbl[5]) return 1;
    if (c >= DbcTbl[6] && c <= DbcTbl[7]) return 1;
    if (c >= DbcTbl[8] && c <= DbcTbl[9]) return 1;
  }
#else						/* SBCS fixed code page */
  if (c != 0) return 0;	/* Always false */
#endif
  return 0;
}


#if FF_USE_LFN

/* Get a character from TCHAR string in defined API encodeing */
static
DWORD tchar2uni (		/* Returns character in UTF-16 encoding (>=0x10000 on double encoding unit, 0xFFFFFFFF on decode error) */
                 const TCHAR** str	/* Pointer to pointer to TCHAR string in configured encoding */
                   )
{
  DWORD uc;
  const TCHAR *p = *str;
  
#if FF_LFN_UNICODE == 1		/* UTF-16 input */
  WCHAR wc;
  
  uc = *p++;
  if (IsSurrogate(uc)) {	/* Surrogate? */
    wc = *p++;		/* Get low surrogate */
    if (!IsSurrogateH(uc) || !IsSurrogateL(wc)) return 0xFFFFFFFF;	/* Wrong surrogate? */
    uc = uc << 16 | wc;
  }
  
#elif FF_LFN_UNICODE == 2	/* UTF-8 input */
  BYTE b;
  int nf;
  
  uc = (BYTE)*p++;	/* Get a byte */
  if (uc & 0x80) {	/* Multiple byte code? */
    if ((uc & 0xE0) == 0xC0) {	/* 2-byte sequence? */
      uc &= 0x1F; nf = 1;
    } else {
      if ((uc & 0xF0) == 0xE0) {	/* 3-byte sequence? */
        uc &= 0x0F; nf = 2;
      } else {
        if ((uc & 0xF8) == 0xF0) {	/* 4-byte sequence? */
          uc &= 0x07; nf = 3;
        } else {					/* Wrong sequence */
          return 0xFFFFFFFF;
        }
      }
    }
    do {	/* Get trailing bytes */
      b = (BYTE)*p++;
      if ((b & 0xC0) != 0x80) return 0xFFFFFFFF;	/* Wrong sequence? */
      uc = uc << 6 | (b & 0x3F);
    } while (--nf != 0);
    if (uc < 0x80 || IsSurrogate(uc) || uc >= 0x110000) return 0xFFFFFFFF;	/* Wrong code? */
    if (uc >= 0x10000) uc = 0xD800DC00 | ((uc - 0x10000) << 6 & 0x3FF0000) | (uc & 0x3FF);	/* Make a surrogate pair if needed */
  }
  
#else		/* ANSI/OEM input */
  BYTE b;
  WCHAR wc;
  
  wc = (BYTE)*p++;			/* Get a byte */
  if (dbc_1st((BYTE)wc)) {	/* Is it a DBC 1st byte? */
    b = (BYTE)*p++;			/* Get 2nd byte */
    if (!dbc_2nd(b)) return 0xFFFFFFFF;	/* Invalid code? */
    wc = (wc << 8) + b;		/* Make a DBC */
  }
  if (wc != 0) {
    wc = ff_oem2uni(wc, CODEPAGE);	/* ANSI/OEM ==> Unicode */
    if (wc == 0) return 0xFFFFFFFF;	/* Invalid code? */
  }
  uc = wc;
  
#endif
  *str = p;	/* Next read pointer */
  return uc;
}


/* Output a TCHAR string in defined API encoding */
static
BYTE put_utf (	/* Returns number of encoding units written (0:buffer overflow or wrong encoding) */
              DWORD chr,	/* UTF-16 encoded character (Double encoding unit char if >=0x10000) */
              TCHAR* buf,	/* Output buffer */
              UINT szb	/* Size of the buffer */
                )
{
#if FF_LFN_UNICODE == 1	/* UTF-16 output */
  WCHAR hs, wc;
  
  hs = (WCHAR)(chr >> 16);
  wc = (WCHAR)chr;
  if (hs == 0) {	/* Single encoding unit? */
    if (szb < 1 || IsSurrogate(wc)) return 0;	/* Buffer overflow or wrong code? */
    *buf = wc;
    return 1;
  }
  if (szb < 2 || !IsSurrogateH(hs) || !IsSurrogateL(wc)) return 0;	/* Buffer overflow or wrong surrogate? */
  *buf++ = hs;
  *buf++ = wc;
  return 2;
  
#elif FF_LFN_UNICODE == 2	/* UTF-8 output */
  DWORD hc;
  
  if (chr < 0x80) {	/* Single byte code? */
    if (szb < 1) return 0;	/* Buffer overflow? */
    *buf = (TCHAR)chr;
    return 1;
  }
  if (chr < 0x800) {	/* 2-byte sequence? */
    if (szb < 2) return 0;	/* Buffer overflow? */
    *buf++ = (TCHAR)(0xC0 | (chr >> 6 & 0x1F));
    *buf++ = (TCHAR)(0x80 | (chr >> 0 & 0x3F));
    return 2;
  }
  if (chr < 0x10000) {	/* 3-byte sequence? */
    if (szb < 3 || IsSurrogate(chr)) return 0;	/* Buffer overflow or wrong code? */
    *buf++ = (TCHAR)(0xE0 | (chr >> 12 & 0x0F));
    *buf++ = (TCHAR)(0x80 | (chr >> 6 & 0x3F));
    *buf++ = (TCHAR)(0x80 | (chr >> 0 & 0x3F));
    return 3;
  }
  /* 4-byte sequence */
  if (szb < 4) return 0;	/* Buffer overflow? */
  hc = ((chr & 0xFFFF0000) - 0xD8000000) >> 6;	/* Get high 10 bits */
  chr = (chr & 0xFFFF) - 0xDC00;					/* Get low 10 bits */
  if (hc >= 0x100000 || chr >= 0x400) return 0;	/* Wrong surrogate? */
  chr = (hc | chr) + 0x10000;
  *buf++ = (TCHAR)(0xF0 | (chr >> 18 & 0x07));
  *buf++ = (TCHAR)(0x80 | (chr >> 12 & 0x3F));
  *buf++ = (TCHAR)(0x80 | (chr >> 6 & 0x3F));
  *buf++ = (TCHAR)(0x80 | (chr >> 0 & 0x3F));
  return 4;
  
#else						/* ANSI/OEM output */
  WCHAR wc;
  
  wc = ff_uni2oem(chr, CODEPAGE);
  if (wc >= 0x100) {	/* Is this a DBC? */
    if (szb < 2) return 0;
    *buf++ = (char)(wc >> 8);	/* Store DBC 1st byte */
    *buf++ = (TCHAR)wc;			/* Store DBC 2nd byte */
    return 2;
  }
  if (wc == 0 || szb < 1) return 0;	/* Invalid char or buffer overflow? */
  *buf++ = (TCHAR)wc;					/* Store the character */
  return 1;
#endif
}
#endif	/* FF_USE_LFN */


#if FF_FS_REENTRANT
/*-----------------------------------------------------------------------*/
/* Request/Release grant to access the volume                            */
/*-----------------------------------------------------------------------*/
static
int lock_fs (		/* 1:Ok, 0:timeout */
             FATFS* fs		/* Filesystem object */
               )
{
  return ff_req_grant(fs->sobj);
}


static
void unlock_fs (
                FATFS* fs,		/* Filesystem object */
                FRESULT res		/* Result code to be returned */
                  )
{
  if (fs && res != FR_NOT_ENABLED && res != FR_INVALID_DRIVE && res != FR_TIMEOUT) {
    ff_rel_grant(fs->sobj);
  }
}

#endif



#if FF_FS_LOCK != 0
/*-----------------------------------------------------------------------*/
/* File lock control functions                                           */
/*-----------------------------------------------------------------------*/

static
FRESULT chk_lock (	/* Check if the file can be accessed */
                  DIR* dp,		/* Directory object pointing the file to be checked */
                  int acc			/* Desired access type (0:Read mode open, 1:Write mode open, 2:Delete or rename) */
                    )
{
  UINT i, be;
  
  /* Search open object table for the object */
  be = 0;
  for (i = 0; i < FF_FS_LOCK; i++) {
    if (Files[i].fs) {	/* Existing entry */
      if (Files[i].fs == dp->obj.fs &&	 	/* Check if the object matches with an open object */
          Files[i].clu == dp->obj.sclust &&
            Files[i].ofs == dp->dptr) break;
    } else {			/* Blank entry */
      be = 1;
    }
  }
  if (i == FF_FS_LOCK) {	/* The object has not been opened */
    return (!be && acc != 2) ? FR_TOO_MANY_OPEN_FILES : FR_OK;	/* Is there a blank entry for new object? */
  }
  
  /* The object was opened. Reject any open against writing file and all write mode open */
  return (acc != 0 || Files[i].ctr == 0x100) ? FR_LOCKED : FR_OK;
}


static
int enq_lock (void)	/* Check if an entry is available for a new object */
{
  UINT i;
  
  for (i = 0; i < FF_FS_LOCK && Files[i].fs; i++) ;
  return (i == FF_FS_LOCK) ? 0 : 1;
}


static
UINT inc_lock (	/* Increment object open counter and returns its index (0:Internal error) */
               DIR* dp,	/* Directory object pointing the file to register or increment */
               int acc		/* Desired access (0:Read, 1:Write, 2:Delete/Rename) */
                 )
{
  UINT i;
  
  
  for (i = 0; i < FF_FS_LOCK; i++) {	/* Find the object */
    if (Files[i].fs == dp->obj.fs &&
        Files[i].clu == dp->obj.sclust &&
          Files[i].ofs == dp->dptr) break;
  }
  
  if (i == FF_FS_LOCK) {				/* Not opened. Register it as new. */
    for (i = 0; i < FF_FS_LOCK && Files[i].fs; i++) ;
    if (i == FF_FS_LOCK) return 0;	/* No free entry to register (int err) */
    Files[i].fs = dp->obj.fs;
    Files[i].clu = dp->obj.sclust;
    Files[i].ofs = dp->dptr;
    Files[i].ctr = 0;
  }
  
  if (acc >= 1 && Files[i].ctr) return 0;	/* Access violation (int err) */
  
  Files[i].ctr = acc ? 0x100 : Files[i].ctr + 1;	/* Set semaphore value */
  
  return i + 1;	/* Index number origin from 1 */
}


static
FRESULT dec_lock (	/* Decrement object open counter */
                  UINT i			/* Semaphore index (1..) */
                    )
{
  WORD n;
  FRESULT res;
  
  
  if (--i < FF_FS_LOCK) {	/* Index number origin from 0 */
    n = Files[i].ctr;
    if (n == 0x100) n = 0;		/* If write mode open, delete the entry */
    if (n > 0) n--;				/* Decrement read mode open count */
    Files[i].ctr = n;
    if (n == 0) Files[i].fs = 0;	/* Delete the entry if open count gets zero */
    res = FR_OK;
  } else {
    res = FR_INT_ERR;			/* Invalid index nunber */
  }
  return res;
}


static
void clear_lock (	/* Clear lock entries of the volume */
                 FATFS *fs
                   )
{
  UINT i;
  
  for (i = 0; i < FF_FS_LOCK; i++) {
    if (Files[i].fs == fs) Files[i].fs = 0;
  }
}

#endif	/* FF_FS_LOCK != 0 */



/*-----------------------------------------------------------------------*/
/* Move/Flush disk access window in the filesystem object                */
/*-----------------------------------------------------------------------*/
#if !FF_FS_READONLY
static
FRESULT sync_window (	/* Returns FR_OK or FR_DISK_ERR */
                     FATFS* fs			/* Filesystem object */
                       )
{
  FRESULT res = FR_OK;
  
  
  if (fs->wflag) {	/* Is the disk access window dirty */
    if (disk_write(fs->pdrv, fs->win, fs->winsect, 1) == RES_OK) {	/* Write back the window */
      fs->wflag = 0;	/* Clear window dirty flag */
      if (fs->winsect - fs->fatbase < fs->fsize) {	/* Is it in the 1st FAT? */
        if (fs->n_fats == 2) disk_write(fs->pdrv, fs->win, fs->winsect + fs->fsize, 1);	/* Reflect it to 2nd FAT if needed */
      }
    } else {
      res = FR_DISK_ERR;
    }
  }
  return res;
}
#endif


static
FRESULT move_window (	/* Returns FR_OK or FR_DISK_ERR */
                     FATFS* fs,			/* Filesystem object */
                     DWORD sector		/* Sector number to make appearance in the fs->win[] */
                       )
{
  FRESULT res = FR_OK;
  
  
  if (sector != fs->winsect) {	/* Window offset changed? */
#if !FF_FS_READONLY
    res = sync_window(fs);		/* Write-back changes */
#endif
    if (res == FR_OK) {			/* Fill sector window with new data */
      if (disk_read(fs->pdrv, fs->win, sector, 1) != RES_OK) {
        sector = 0xFFFFFFFF;	/* Invalidate window if read data is not valid */
        res = FR_DISK_ERR;
      }
      fs->winsect = sector;
    }
  }
  return res;
}




#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Synchronize filesystem and data on the storage                        */
/*-----------------------------------------------------------------------*/

static
FRESULT sync_fs (	/* Returns FR_OK or FR_DISK_ERR */
                 FATFS* fs		/* Filesystem object */
                   )
{
  FRESULT res;
  
  
  res = sync_window(fs);
  if (res == FR_OK) {
    if (fs->fs_type == FS_FAT32 && fs->fsi_flag == 1) {	/* FAT32: Update FSInfo sector if needed */
      /* Create FSInfo structure */
      mem_set(fs->win, 0, SS(fs));
      st_word(fs->win + BS_55AA, 0xAA55);
      st_dword(fs->win + FSI_LeadSig, 0x41615252);
      st_dword(fs->win + FSI_StrucSig, 0x61417272);
      st_dword(fs->win + FSI_Free_Count, fs->free_clst);
      st_dword(fs->win + FSI_Nxt_Free, fs->last_clst);
      /* Write it into the FSInfo sector */
      fs->winsect = fs->volbase + 1;
      disk_write(fs->pdrv, fs->win, fs->winsect, 1);
      fs->fsi_flag = 0;
    }
    /* Make sure that no pending write process in the lower layer */
    if (disk_ioctl(fs->pdrv, CTRL_SYNC, 0) != RES_OK) res = FR_DISK_ERR;
  }
  
  return res;
}

#endif



/*-----------------------------------------------------------------------*/
/* Get physical sector number from cluster number                        */
/*-----------------------------------------------------------------------*/

static
DWORD clst2sect (	/* !=0:Sector number, 0:Failed (invalid cluster#) */
                 FATFS* fs,		/* Filesystem object */
                 DWORD clst		/* Cluster# to be converted */
                   )
{
  clst -= 2;		/* Cluster number is origin from 2 */
  if (clst >= fs->n_fatent - 2) return 0;		/* Is it invalid cluster number? */
  return fs->database + fs->csize * clst;		/* Start sector number of the cluster */
}




/*-----------------------------------------------------------------------*/
/* FAT access - Read value of a FAT entry                                */
/*-----------------------------------------------------------------------*/

static
DWORD get_fat (		/* 0xFFFFFFFF:Disk error, 1:Internal error, 2..0x7FFFFFFF:Cluster status */
               FFOBJID* obj,	/* Corresponding object */
               DWORD clst		/* Cluster number to get the value */
                 )
{
  UINT wc, bc;
  DWORD val;
  FATFS *fs = obj->fs;
  
  
  if (clst < 2 || clst >= fs->n_fatent) {	/* Check if in valid range */
    val = 1;	/* Internal error */
    
  } else {
    val = 0xFFFFFFFF;	/* Default value falls on disk error */
    
    switch (fs->fs_type) {
    case FS_FAT12 :
      bc = (UINT)clst; bc += bc / 2;
      if (move_window(fs, fs->fatbase + (bc / SS(fs))) != FR_OK) break;
      wc = fs->win[bc++ % SS(fs)];		/* Get 1st byte of the entry */
      if (move_window(fs, fs->fatbase + (bc / SS(fs))) != FR_OK) break;
      wc |= fs->win[bc % SS(fs)] << 8;	/* Merge 2nd byte of the entry */
      val = (clst & 1) ? (wc >> 4) : (wc & 0xFFF);	/* Adjust bit position */
      break;
      
    case FS_FAT16 :
      if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 2))) != FR_OK) break;
      val = ld_word(fs->win + clst * 2 % SS(fs));		/* Simple WORD array */
      break;
      
    case FS_FAT32 :
      if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))) != FR_OK) break;
      val = ld_dword(fs->win + clst * 4 % SS(fs)) & 0x0FFFFFFF;	/* Simple DWORD array but mask out upper 4 bits */
      break;
#if FF_FS_EXFAT
    case FS_EXFAT :
      if (obj->objsize != 0 || obj->sclust == 0) {	/* Object except root dir must have valid data */
        DWORD cofs = clst - obj->sclust;	/* Offset from start cluster */
        DWORD clen = (DWORD)((obj->objsize - 1) / SS(fs)) / fs->csize;	/* Number of clusters - 1 */
        
        if (obj->stat == 2 && cofs <= clen) {	/* Is it a contiguous chain? */
          val = (cofs == clen) ? 0x7FFFFFFF : clst + 1;	/* No data on the FAT, generate the value */
          break;
        }
        if (obj->stat == 3 && cofs < obj->n_cont) {	/* Is it in the 1st fragment? */
          val = clst + 1; 	/* Generate the value */
          break;
        }
        if (obj->stat != 2) {	/* Get value from FAT if FAT chain is valid */
          if (obj->n_frag != 0) {	/* Is it on the growing edge? */
            val = 0x7FFFFFFF;	/* Generate EOC */
          } else {
            if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))) != FR_OK) break;
            val = ld_dword(fs->win + clst * 4 % SS(fs)) & 0x7FFFFFFF;
          }
          break;
        }
      }
      /* go to default */
#endif
    default:
      val = 1;	/* Internal error */
    }
  }
  
  return val;
}




#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* FAT access - Change value of a FAT entry                              */
/*-----------------------------------------------------------------------*/

static
FRESULT put_fat (	/* FR_OK(0):succeeded, !=0:error */
                 FATFS* fs,		/* Corresponding filesystem object */
                 DWORD clst,		/* FAT index number (cluster number) to be changed */
                 DWORD val		/* New value to be set to the entry */
                   )
{
  UINT bc;
  BYTE *p;
  FRESULT res = FR_INT_ERR;
  
  
  if (clst >= 2 && clst < fs->n_fatent) {	/* Check if in valid range */
    switch (fs->fs_type) {
    case FS_FAT12 :
      bc = (UINT)clst; bc += bc / 2;	/* bc: byte offset of the entry */
      res = move_window(fs, fs->fatbase + (bc / SS(fs)));
      if (res != FR_OK) break;
      p = fs->win + bc++ % SS(fs);
      *p = (clst & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val;		/* Put 1st byte */
      fs->wflag = 1;
      res = move_window(fs, fs->fatbase + (bc / SS(fs)));
      if (res != FR_OK) break;
      p = fs->win + bc % SS(fs);
      *p = (clst & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F));	/* Put 2nd byte */
      fs->wflag = 1;
      break;
      
    case FS_FAT16 :
      res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 2)));
      if (res != FR_OK) break;
      st_word(fs->win + clst * 2 % SS(fs), (WORD)val);	/* Simple WORD array */
      fs->wflag = 1;
      break;
      
    case FS_FAT32 :
#if FF_FS_EXFAT
    case FS_EXFAT :
#endif
      res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)));
      if (res != FR_OK) break;
      if (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) {
        val = (val & 0x0FFFFFFF) | (ld_dword(fs->win + clst * 4 % SS(fs)) & 0xF0000000);
      }
      st_dword(fs->win + clst * 4 % SS(fs), val);
      fs->wflag = 1;
      break;
    }
  }
  return res;
}

#endif /* !FF_FS_READONLY */




#if FF_FS_EXFAT && !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* exFAT: Accessing FAT and Allocation Bitmap                            */
/*-----------------------------------------------------------------------*/

/*--------------------------------------*/
/* Find a contiguous free cluster block */
/*--------------------------------------*/

static
DWORD find_bitmap (	/* 0:Not found, 2..:Cluster block found, 0xFFFFFFFF:Disk error */
                   FATFS* fs,	/* Filesystem object */
                   DWORD clst,	/* Cluster number to scan from */
                   DWORD ncl	/* Number of contiguous clusters to find (1..) */
                     )
{
  BYTE bm, bv;
  UINT i;
  DWORD val, scl, ctr;
  
  
  clst -= 2;	/* The first bit in the bitmap corresponds to cluster #2 */
  if (clst >= fs->n_fatent - 2) clst = 0;
  scl = val = clst; ctr = 0;
  for (;;) {
    if (move_window(fs, fs->database + val / 8 / SS(fs)) != FR_OK) return 0xFFFFFFFF;	/* (assuming bitmap is located top of the cluster heap) */
    i = val / 8 % SS(fs); bm = 1 << (val % 8);
    do {
      do {
        bv = fs->win[i] & bm; bm <<= 1;		/* Get bit value */
        if (++val >= fs->n_fatent - 2) {	/* Next cluster (with wrap-around) */
          val = 0; bm = 0; i = SS(fs);
        }
        if (bv == 0) {	/* Is it a free cluster? */
          if (++ctr == ncl) return scl + 2;	/* Check if run length is sufficient for required */
        } else {
          scl = val; ctr = 0;		/* Encountered a cluster in-use, restart to scan */
        }
        if (val == clst) return 0;	/* All cluster scanned? */
      } while (bm != 0);
      bm = 1;
    } while (++i < SS(fs));
  }
}


/*----------------------------------------*/
/* Set/Clear a block of allocation bitmap */
/*----------------------------------------*/

static
FRESULT change_bitmap (
                       FATFS* fs,	/* Filesystem object */
                       DWORD clst,	/* Cluster number to change from */
                       DWORD ncl,	/* Number of clusters to be changed */
                       int bv		/* bit value to be set (0 or 1) */
                         )
{
  BYTE bm;
  UINT i;
  DWORD sect;
  
  
  clst -= 2;	/* The first bit corresponds to cluster #2 */
  sect = fs->database + clst / 8 / SS(fs);	/* Sector address (assuming bitmap is located top of the cluster heap) */
  i = clst / 8 % SS(fs);						/* Byte offset in the sector */
  bm = 1 << (clst % 8);						/* Bit mask in the byte */
  for (;;) {
    if (move_window(fs, sect++) != FR_OK) return FR_DISK_ERR;
    do {
      do {
        if (bv == (int)((fs->win[i] & bm) != 0)) return FR_INT_ERR;	/* Is the bit expected value? */
        fs->win[i] ^= bm;	/* Flip the bit */
        fs->wflag = 1;
        if (--ncl == 0) return FR_OK;	/* All bits processed? */
      } while (bm <<= 1);		/* Next bit */
      bm = 1;
    } while (++i < SS(fs));		/* Next byte */
    i = 0;
  }
}


/*---------------------------------------------*/
/* Fill the first fragment of the FAT chain    */
/*---------------------------------------------*/

static
FRESULT fill_first_frag (
                         FFOBJID* obj	/* Pointer to the corresponding object */
                           )
{
  FRESULT res;
  DWORD cl, n;
  
  
  if (obj->stat == 3) {	/* Has the object been changed 'fragmented' in this session? */
    for (cl = obj->sclust, n = obj->n_cont; n; cl++, n--) {	/* Create cluster chain on the FAT */
      res = put_fat(obj->fs, cl, cl + 1);
      if (res != FR_OK) return res;
    }
    obj->stat = 0;	/* Change status 'FAT chain is valid' */
  }
  return FR_OK;
}


/*---------------------------------------------*/
/* Fill the last fragment of the FAT chain     */
/*---------------------------------------------*/

static
FRESULT fill_last_frag (
                        FFOBJID* obj,	/* Pointer to the corresponding object */
                        DWORD lcl,		/* Last cluster of the fragment */
                        DWORD term		/* Value to set the last FAT entry */
                          )
{
  FRESULT res;
  
  
  while (obj->n_frag > 0) {	/* Create the chain of last fragment */
    res = put_fat(obj->fs, lcl - obj->n_frag + 1, (obj->n_frag > 1) ? lcl - obj->n_frag + 2 : term);
    if (res != FR_OK) return res;
    obj->n_frag--;
  }
  return FR_OK;
}

#endif	/* FF_FS_EXFAT && !FF_FS_READONLY */



#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* FAT handling - Remove a cluster chain                                 */
/*-----------------------------------------------------------------------*/
static
FRESULT remove_chain (	/* FR_OK(0):succeeded, !=0:error */
                      FFOBJID* obj,		/* Corresponding object */
                      DWORD clst,			/* Cluster to remove a chain from */
                      DWORD pclst			/* Previous cluster of clst (0:entire chain) */
                        )
{
  FRESULT res = FR_OK;
  DWORD nxt;
  FATFS *fs = obj->fs;
#if FF_FS_EXFAT || FF_USE_TRIM
  DWORD scl = clst, ecl = clst;
#endif
#if FF_USE_TRIM
  DWORD rt[2];
#endif
  
  if (clst < 2 || clst >= fs->n_fatent) return FR_INT_ERR;	/* Check if in valid range */
  
  /* Mark the previous cluster 'EOC' on the FAT if it exists */
  if (pclst != 0 && (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT || obj->stat != 2)) {
    res = put_fat(fs, pclst, 0xFFFFFFFF);
    if (res != FR_OK) return res;
  }
  
  /* Remove the chain */
  do {
    nxt = get_fat(obj, clst);			/* Get cluster status */
    if (nxt == 0) break;				/* Empty cluster? */
    if (nxt == 1) return FR_INT_ERR;	/* Internal error? */
    if (nxt == 0xFFFFFFFF) return FR_DISK_ERR;	/* Disk error? */
    if (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) {
      res = put_fat(fs, clst, 0);		/* Mark the cluster 'free' on the FAT */
      if (res != FR_OK) return res;
    }
    if (fs->free_clst < fs->n_fatent - 2) {	/* Update FSINFO */
      fs->free_clst++;
      fs->fsi_flag |= 1;
    }
#if FF_FS_EXFAT || FF_USE_TRIM
    if (ecl + 1 == nxt) {	/* Is next cluster contiguous? */
      ecl = nxt;
    } else {				/* End of contiguous cluster block */
#if FF_FS_EXFAT
      if (fs->fs_type == FS_EXFAT) {
        res = change_bitmap(fs, scl, ecl - scl + 1, 0);	/* Mark the cluster block 'free' on the bitmap */
        if (res != FR_OK) return res;
      }
#endif
#if FF_USE_TRIM
      rt[0] = clst2sect(fs, scl);					/* Start of data area freed */
      rt[1] = clst2sect(fs, ecl) + fs->csize - 1;	/* End of data area freed */
      disk_ioctl(fs->pdrv, CTRL_TRIM, rt);		/* Inform device the data in the block is no longer needed */
#endif
      scl = ecl = nxt;
    }
#endif
    clst = nxt;					/* Next cluster */
  } while (clst < fs->n_fatent);	/* Repeat while not the last link */
  
#if FF_FS_EXFAT
  /* Some post processes for chain status */
  if (fs->fs_type == FS_EXFAT) {
    if (pclst == 0) {	/* Has the entire chain been removed? */
      obj->stat = 0;		/* Change the chain status 'initial' */
    } else {
      if (obj->stat == 0) {	/* Is it a fragmented chain from the beginning of this session? */
        clst = obj->sclust;		/* Follow the chain to check if it gets contiguous */
        while (clst != pclst) {
          nxt = get_fat(obj, clst);
          if (nxt < 2) return FR_INT_ERR;
          if (nxt == 0xFFFFFFFF) return FR_DISK_ERR;
          if (nxt != clst + 1) break;	/* Not contiguous? */
          clst++;
        }
        if (clst == pclst) {	/* Has the chain got contiguous again? */
          obj->stat = 2;		/* Change the chain status 'contiguous' */
        }
      } else {
        if (obj->stat == 3 && pclst >= obj->sclust && pclst <= obj->sclust + obj->n_cont) {	/* Was the chain fragmented in this session and got contiguous again? */
          obj->stat = 2;	/* Change the chain status 'contiguous' */
        }
      }
    }
  }
#endif
  return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* FAT handling - Stretch a chain or Create a new chain                  */
/*-----------------------------------------------------------------------*/
static
DWORD create_chain (	/* 0:No free cluster, 1:Internal error, 0xFFFFFFFF:Disk error, >=2:New cluster# */
                    FFOBJID* obj,		/* Corresponding object */
                    DWORD clst			/* Cluster# to stretch, 0:Create a new chain */
                      )
{
  DWORD cs, ncl, scl;
  FRESULT res;
  FATFS *fs = obj->fs;
  
  
  if (clst == 0) {	/* Create a new chain */
    scl = fs->last_clst;				/* Suggested cluster to start to find */
    if (scl == 0 || scl >= fs->n_fatent) scl = 1;
  }
  else {				/* Stretch a chain */
    cs = get_fat(obj, clst);			/* Check the cluster status */
    if (cs < 2) return 1;				/* Test for insanity */
    if (cs == 0xFFFFFFFF) return cs;	/* Test for disk error */
    if (cs < fs->n_fatent) return cs;	/* It is already followed by next cluster */
    scl = clst;							/* Cluster to start to find */
  }
  if (fs->free_clst == 0) return 0;		/* No free cluster */
  
#if FF_FS_EXFAT
  if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
    ncl = find_bitmap(fs, scl, 1);				/* Find a free cluster */
    if (ncl == 0 || ncl == 0xFFFFFFFF) return ncl;	/* No free cluster or hard error? */
    res = change_bitmap(fs, ncl, 1, 1);			/* Mark the cluster 'in use' */
    if (res == FR_INT_ERR) return 1;
    if (res == FR_DISK_ERR) return 0xFFFFFFFF;
    if (clst == 0) {							/* Is it a new chain? */
      obj->stat = 2;							/* Set status 'contiguous' */
    } else {									/* It is a stretched chain */
      if (obj->stat == 2 && ncl != scl + 1) {	/* Is the chain got fragmented? */
        obj->n_cont = scl - obj->sclust;	/* Set size of the contiguous part */
        obj->stat = 3;						/* Change status 'just fragmented' */
      }
    }
    if (obj->stat != 2) {	/* Is the file non-contiguous? */
      if (ncl == clst + 1) {	/* Is the cluster next to previous one? */
        obj->n_frag = obj->n_frag ? obj->n_frag + 1 : 2;	/* Increment size of last framgent */
      } else {				/* New fragment */
        if (obj->n_frag == 0) obj->n_frag = 1;
        res = fill_last_frag(obj, clst, ncl);	/* Fill last fragment on the FAT and link it to new one */
        if (res == FR_OK) obj->n_frag = 1;
      }
    }
  } else
#endif
  {	/* On the FAT/FAT32 volume */
    ncl = 0;
    if (scl == clst) {						/* Stretching an existing chain? */
      ncl = scl + 1;						/* Test if next cluster is free */
      if (ncl >= fs->n_fatent) ncl = 2;
      cs = get_fat(obj, ncl);				/* Get next cluster status */
      if (cs == 1 || cs == 0xFFFFFFFF) return cs;	/* Test for error */
      if (cs != 0) {						/* Not free? */
        cs = fs->last_clst;				/* Start at suggested cluster if it is valid */
        if (cs >= 2 && cs < fs->n_fatent) scl = cs;
        ncl = 0;
      }
    }
    if (ncl == 0) {	/* The new cluster cannot be contiguous and find another fragment */
      ncl = scl;	/* Start cluster */
      for (;;) {
        ncl++;							/* Next cluster */
        if (ncl >= fs->n_fatent) {		/* Check wrap-around */
          ncl = 2;
          if (ncl > scl) return 0;	/* No free cluster found? */
        }
        cs = get_fat(obj, ncl);			/* Get the cluster status */
        if (cs == 0) break;				/* Found a free cluster? */
        if (cs == 1 || cs == 0xFFFFFFFF) return cs;	/* Test for error */
        if (ncl == scl) return 0;		/* No free cluster found? */
      }
    }
    res = put_fat(fs, ncl, 0xFFFFFFFF);		/* Mark the new cluster 'EOC' */
    if (res == FR_OK && clst != 0) {
      res = put_fat(fs, clst, ncl);		/* Link it from the previous one if needed */
    }
  }
  
  if (res == FR_OK) {			/* Update FSINFO if function succeeded. */
    fs->last_clst = ncl;
    if (fs->free_clst <= fs->n_fatent - 2) fs->free_clst--;
    fs->fsi_flag |= 1;
  } else {
    ncl = (res == FR_DISK_ERR) ? 0xFFFFFFFF : 1;	/* Failed. Generate error status */
  }
  
  return ncl;		/* Return new cluster number or error status */
}

#endif /* !FF_FS_READONLY */




#if FF_USE_FASTSEEK
/*-----------------------------------------------------------------------*/
/* FAT handling - Convert offset into cluster with link map table        */
/*-----------------------------------------------------------------------*/

static
DWORD clmt_clust (	/* <2:Error, >=2:Cluster number */
                  FIL* fp,		/* Pointer to the file object */
                  FSIZE_t ofs		/* File offset to be converted to cluster# */
                    )
{
  DWORD cl, ncl, *tbl;
  FATFS *fs = fp->obj.fs;
  
  
  tbl = fp->cltbl + 1;	/* Top of CLMT */
  cl = (DWORD)(ofs / SS(fs) / fs->csize);	/* Cluster order from top of the file */
  for (;;) {
    ncl = *tbl++;			/* Number of cluters in the fragment */
    if (ncl == 0) return 0;	/* End of table? (error) */
    if (cl < ncl) break;	/* In this fragment? */
    cl -= ncl; tbl++;		/* Next fragment */
  }
  return cl + *tbl;	/* Return the cluster number */
}

#endif	/* FF_USE_FASTSEEK */




/*-----------------------------------------------------------------------*/
/* Directory handling - Fill a cluster with zeros                        */
/*-----------------------------------------------------------------------*/

#if !FF_FS_READONLY
static
FRESULT dir_clear (	/* Returns FR_OK or FR_DISK_ERR */
                   FATFS *fs,		/* Filesystem object */
                   DWORD clst		/* Directory table to clear */
                     )
{
  DWORD sect;
  UINT n, szb;
  BYTE *ibuf = 0;
  
  
  if (sync_window(fs) != FR_OK) return FR_DISK_ERR;	/* Flush disk access window */
  sect = clst2sect(fs, clst);		/* Top of the cluster */
  fs->winsect = sect;				/* Set window to top of the cluster */
  mem_set(fs->win, 0, SS(fs));	/* Clear window buffer */
#if FF_USE_LFN == 3		/* Quick table clear by using multi-secter write */
  /* Allocate a temporary buffer */
  for (szb = ((DWORD)fs->csize * SS(fs) >= MAX_MALLOC) ? MAX_MALLOC : fs->csize * SS(fs); szb > SS(fs) && !(ibuf = ff_memalloc(szb)); szb /= 2) ;
  if (szb > SS(fs)) {		/* Buffer allocated? */
    mem_set(ibuf, 0, szb);
    szb /= SS(fs);		/* Bytes -> Sectors */
    for (n = 0; n < fs->csize && disk_write(fs->pdrv, ibuf, sect + n, szb) == RES_OK; n += szb) ;	/* Fill the cluster with 0 */
    ff_memfree(ibuf);
  } else
#endif
  {
    ibuf = fs->win; szb = 1;	/* Use window buffer (single-sector writes may take a time) */
    for (n = 0; n < fs->csize && disk_write(fs->pdrv, ibuf, sect + n, szb) == RES_OK; n += szb) ;	/* Fill the cluster with 0 */
  }
  return (n == fs->csize) ? FR_OK : FR_DISK_ERR;
}
#endif	/* !FF_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Directory handling - Set directory index                              */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_sdi (	/* FR_OK(0):succeeded, !=0:error */
                 DIR* dp,		/* Pointer to directory object */
                 DWORD ofs		/* Offset of directory table */
                   )
{
  DWORD csz, clst;
  FATFS *fs = dp->obj.fs;
  
  
  if (ofs >= (DWORD)((FF_FS_EXFAT && fs->fs_type == FS_EXFAT) ? MAX_DIR_EX : MAX_DIR) || ofs % SZDIRE) {	/* Check range of offset and alignment */
    return FR_INT_ERR;
  }
  dp->dptr = ofs;				/* Set current offset */
  clst = dp->obj.sclust;		/* Table start cluster (0:root) */
  if (clst == 0 && fs->fs_type >= FS_FAT32) {	/* Replace cluster# 0 with root cluster# */
    clst = fs->dirbase;
    if (FF_FS_EXFAT) dp->obj.stat = 0;	/* exFAT: Root dir has an FAT chain */
  }
  
  if (clst == 0) {	/* Static table (root-directory on the FAT volume) */
    if (ofs / SZDIRE >= fs->n_rootdir) return FR_INT_ERR;	/* Is index out of range? */
    dp->sect = fs->dirbase;
    
  } else {			/* Dynamic table (sub-directory or root-directory on the FAT32/exFAT volume) */
    csz = (DWORD)fs->csize * SS(fs);	/* Bytes per cluster */
    while (ofs >= csz) {				/* Follow cluster chain */
      clst = get_fat(&dp->obj, clst);				/* Get next cluster */
      if (clst == 0xFFFFFFFF) return FR_DISK_ERR;	/* Disk error */
      if (clst < 2 || clst >= fs->n_fatent) return FR_INT_ERR;	/* Reached to end of table or internal error */
      ofs -= csz;
    }
    dp->sect = clst2sect(fs, clst);
  }
  dp->clust = clst;					/* Current cluster# */
  if (dp->sect == 0) return FR_INT_ERR;
  dp->sect += ofs / SS(fs);			/* Sector# of the directory entry */
  dp->dir = fs->win + (ofs % SS(fs));	/* Pointer to the entry in the win[] */
  
  return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Directory handling - Move directory table index next                  */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_next (	/* FR_OK(0):succeeded, FR_NO_FILE:End of table, FR_DENIED:Could not stretch */
                  DIR* dp,		/* Pointer to the directory object */
                  int stretch		/* 0: Do not stretch table, 1: Stretch table if needed */
                    )
{
  DWORD ofs, clst;
  FATFS *fs = dp->obj.fs;
  
  
  ofs = dp->dptr + SZDIRE;	/* Next entry */
  if (dp->sect == 0 || ofs >= (DWORD)((FF_FS_EXFAT && fs->fs_type == FS_EXFAT) ? MAX_DIR_EX : MAX_DIR)) return FR_NO_FILE;	/* Report EOT when offset has reached max value */
  
  if (ofs % SS(fs) == 0) {	/* Sector changed? */
    dp->sect++;				/* Next sector */
    
    if (dp->clust == 0) {	/* Static table */
      if (ofs / SZDIRE >= fs->n_rootdir) {	/* Report EOT if it reached end of static table */
        dp->sect = 0; return FR_NO_FILE;
      }
    }
    else {					/* Dynamic table */
      if ((ofs / SS(fs) & (fs->csize - 1)) == 0) {	/* Cluster changed? */
        clst = get_fat(&dp->obj, dp->clust);		/* Get next cluster */
        if (clst <= 1) return FR_INT_ERR;			/* Internal error */
        if (clst == 0xFFFFFFFF) return FR_DISK_ERR;	/* Disk error */
        if (clst >= fs->n_fatent) {					/* It reached end of dynamic table */
#if !FF_FS_READONLY
          if (!stretch) {								/* If no stretch, report EOT */
            dp->sect = 0; return FR_NO_FILE;
          }
          clst = create_chain(&dp->obj, dp->clust);	/* Allocate a cluster */
          if (clst == 0) return FR_DENIED;			/* No free cluster */
          if (clst == 1) return FR_INT_ERR;			/* Internal error */
          if (clst == 0xFFFFFFFF) return FR_DISK_ERR;	/* Disk error */
          if (dir_clear(fs, clst) != FR_OK) return FR_DISK_ERR;	/* Clean up the stretched table */
          if (FF_FS_EXFAT) dp->obj.stat |= 4;			/* exFAT: The directory has been stretched */
#else
          if (!stretch) dp->sect = 0;					/* (this line is to suppress compiler warning) */
          dp->sect = 0; return FR_NO_FILE;			/* Report EOT */
#endif
        }
        dp->clust = clst;		/* Initialize data for new cluster */
        dp->sect = clst2sect(fs, clst);
      }
    }
  }
  dp->dptr = ofs;						/* Current entry */
  dp->dir = fs->win + ofs % SS(fs);	/* Pointer to the entry in the win[] */
  
  return FR_OK;
}




#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Directory handling - Reserve a block of directory entries             */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_alloc (	/* FR_OK(0):succeeded, !=0:error */
                   DIR* dp,		/* Pointer to the directory object */
                   UINT nent		/* Number of contiguous entries to allocate */
                     )
{
  FRESULT res;
  UINT n;
  FATFS *fs = dp->obj.fs;
  
  
  res = dir_sdi(dp, 0);
  if (res == FR_OK) {
    n = 0;
    do {
      res = move_window(fs, dp->sect);
      if (res != FR_OK) break;
#if FF_FS_EXFAT
      if ((fs->fs_type == FS_EXFAT) ? (int)((dp->dir[XDIR_Type] & 0x80) == 0) : (int)(dp->dir[DIR_Name] == DDEM || dp->dir[DIR_Name] == 0)) {
#else
        if (dp->dir[DIR_Name] == DDEM || dp->dir[DIR_Name] == 0) {
#endif
          if (++n == nent) break;	/* A block of contiguous free entries is found */
        } else {
          n = 0;					/* Not a blank entry. Restart to search */
        }
        res = dir_next(dp, 1);
      } while (res == FR_OK);	/* Next entry with table stretch enabled */
    }
    
    if (res == FR_NO_FILE) res = FR_DENIED;	/* No directory entry to allocate */
    return res;
  }
  
#endif	/* !FF_FS_READONLY */
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* FAT: Directory handling - Load/Store start cluster number             */
  /*-----------------------------------------------------------------------*/
  
  static
    DWORD ld_clust (	/* Returns the top cluster value of the SFN entry */
                    FATFS* fs,		/* Pointer to the fs object */
                    const BYTE* dir	/* Pointer to the key entry */
                      )
    {
      DWORD cl;
      
      cl = ld_word(dir + DIR_FstClusLO);
      if (fs->fs_type == FS_FAT32) {
        cl |= (DWORD)ld_word(dir + DIR_FstClusHI) << 16;
      }
      
      return cl;
    }
  
  
#if !FF_FS_READONLY
  static
    void st_clust (
                   FATFS* fs,	/* Pointer to the fs object */
                   BYTE* dir,	/* Pointer to the key entry */
                   DWORD cl	/* Value to be set */
                     )
    {
      st_word(dir + DIR_FstClusLO, (WORD)cl);
      if (fs->fs_type == FS_FAT32) {
        st_word(dir + DIR_FstClusHI, (WORD)(cl >> 16));
      }
    }
#endif
  
  
  
#if FF_USE_LFN
  /*--------------------------------------------------------*/
  /* FAT-LFN: Compare a part of file name with an LFN entry */
  /*--------------------------------------------------------*/
  static
    int cmp_lfn (				/* 1:matched, 0:not matched */
                 const WCHAR* lfnbuf,	/* Pointer to the LFN working buffer to be compared */
                 BYTE* dir				/* Pointer to the directory entry containing the part of LFN */
                   )
    {
      UINT i, s;
      WCHAR wc, uc;
      
      
      if (ld_word(dir + LDIR_FstClusLO) != 0) return 0;	/* Check LDIR_FstClusLO */
      
      i = ((dir[LDIR_Ord] & 0x3F) - 1) * 13;	/* Offset in the LFN buffer */
      
      for (wc = 1, s = 0; s < 13; s++) {		/* Process all characters in the entry */
        uc = ld_word(dir + LfnOfs[s]);		/* Pick an LFN character */
        if (wc != 0) {
          if (i >= FF_MAX_LFN || ff_wtoupper(uc) != ff_wtoupper(lfnbuf[i++])) {	/* Compare it */
            return 0;					/* Not matched */
          }
          wc = uc;
        } else {
          if (uc != 0xFFFF) return 0;		/* Check filler */
        }
      }
      
      if ((dir[LDIR_Ord] & LLEF) && wc && lfnbuf[i]) return 0;	/* Last segment matched but different length */
      
      return 1;		/* The part of LFN matched */
    }
  
  
#if FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 || FF_USE_LABEL || FF_FS_EXFAT
  /*-----------------------------------------------------*/
  /* FAT-LFN: Pick a part of file name from an LFN entry */
  /*-----------------------------------------------------*/
  static
    int pick_lfn (			/* 1:succeeded, 0:buffer overflow or invalid LFN entry */
                  WCHAR* lfnbuf,		/* Pointer to the LFN working buffer */
                  BYTE* dir			/* Pointer to the LFN entry */
                    )
    {
      UINT i, s;
      WCHAR wc, uc;
      
      
      if (ld_word(dir + LDIR_FstClusLO) != 0) return 0;	/* Check LDIR_FstClusLO is 0 */
      
      i = ((dir[LDIR_Ord] & ~LLEF) - 1) * 13;	/* Offset in the LFN buffer */
      
      for (wc = 1, s = 0; s < 13; s++) {		/* Process all characters in the entry */
        uc = ld_word(dir + LfnOfs[s]);		/* Pick an LFN character */
        if (wc != 0) {
          if (i >= FF_MAX_LFN) return 0;	/* Buffer overflow? */
          lfnbuf[i++] = wc = uc;			/* Store it */
        } else {
          if (uc != 0xFFFF) return 0;		/* Check filler */
        }
      }
      
      if (dir[LDIR_Ord] & LLEF) {				/* Put terminator if it is the last LFN part */
        if (i >= FF_MAX_LFN) return 0;		/* Buffer overflow? */
        lfnbuf[i] = 0;
      }
      
      return 1;		/* The part of LFN is valid */
    }
#endif
  
  
#if !FF_FS_READONLY
  /*-----------------------------------------*/
  /* FAT-LFN: Create an entry of LFN entries */
  /*-----------------------------------------*/
  static
    void put_lfn (
                  const WCHAR* lfn,	/* Pointer to the LFN */
                  BYTE* dir,			/* Pointer to the LFN entry to be created */
                  BYTE ord,			/* LFN order (1-20) */
                  BYTE sum			/* Checksum of the corresponding SFN */
                    )
    {
      UINT i, s;
      WCHAR wc;
      
      
      dir[LDIR_Chksum] = sum;			/* Set checksum */
      dir[LDIR_Attr] = AM_LFN;		/* Set attribute. LFN entry */
      dir[LDIR_Type] = 0;
      st_word(dir + LDIR_FstClusLO, 0);
      
      i = (ord - 1) * 13;				/* Get offset in the LFN working buffer */
      s = wc = 0;
      do {
        if (wc != 0xFFFF) wc = lfn[i++];	/* Get an effective character */
        st_word(dir + LfnOfs[s], wc);		/* Put it */
        if (wc == 0) wc = 0xFFFF;		/* Padding characters for left locations */
      } while (++s < 13);
      if (wc == 0xFFFF || !lfn[i]) ord |= LLEF;	/* Last LFN part is the start of LFN sequence */
      dir[LDIR_Ord] = ord;			/* Set the LFN order */
    }
  
#endif	/* !FF_FS_READONLY */
#endif	/* FF_USE_LFN */
  
  
  
#if FF_USE_LFN && !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* FAT-LFN: Create a Numbered SFN                                        */
  /*-----------------------------------------------------------------------*/
  
  static
    void gen_numname (
                      BYTE* dst,			/* Pointer to the buffer to store numbered SFN */
                      const BYTE* src,	/* Pointer to SFN */
                      const WCHAR* lfn,	/* Pointer to LFN */
                      UINT seq			/* Sequence number */
                        )
    {
      BYTE ns[8], c;
      UINT i, j;
      WCHAR wc;
      DWORD sr;
      
      
      mem_cpy(dst, src, 11);
      
      if (seq > 5) {	/* In case of many collisions, generate a hash number instead of sequential number */
        sr = seq;
        while (*lfn) {	/* Create a CRC */
          wc = *lfn++;
          for (i = 0; i < 16; i++) {
            sr = (sr << 1) + (wc & 1);
            wc >>= 1;
            if (sr & 0x10000) sr ^= 0x11021;
          }
        }
        seq = (UINT)sr;
      }
      
      /* itoa (hexdecimal) */
      i = 7;
      do {
        c = (BYTE)((seq % 16) + '0');
        if (c > '9') c += 7;
        ns[i--] = c;
        seq /= 16;
      } while (seq);
      ns[i] = '~';
      
      /* Append the number to the SFN body */
      for (j = 0; j < i && dst[j] != ' '; j++) {
        if (dbc_1st(dst[j])) {
          if (j == i - 1) break;
          j++;
        }
      }
      do {
        dst[j++] = (i < 8) ? ns[i++] : ' ';
      } while (j < 8);
    }
#endif	/* FF_USE_LFN && !FF_FS_READONLY */
  
  
  
#if FF_USE_LFN
  /*-----------------------------------------------------------------------*/
  /* FAT-LFN: Calculate checksum of an SFN entry                           */
  /*-----------------------------------------------------------------------*/
  
  static
    BYTE sum_sfn (
                  const BYTE* dir		/* Pointer to the SFN entry */
                    )
    {
      BYTE sum = 0;
      UINT n = 11;
      
      do {
        sum = (sum >> 1) + (sum << 7) + *dir++;
      } while (--n);
      return sum;
    }
  
#endif	/* FF_USE_LFN */
  
  
  
#if FF_FS_EXFAT
  /*-----------------------------------------------------------------------*/
  /* exFAT: Checksum                                                       */
  /*-----------------------------------------------------------------------*/
  
  static
    WORD xdir_sum (			/* Get checksum of the directoly entry block */
                   const BYTE* dir		/* Directory entry block to be calculated */
                     )
    {
      UINT i, szblk;
      WORD sum;
      
      
      szblk = (dir[XDIR_NumSec] + 1) * SZDIRE;
      for (i = sum = 0; i < szblk; i++) {
        if (i == XDIR_SetSum) {	/* Skip sum field */
          i++;
        } else {
          sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + dir[i];
        }
      }
      return sum;
    }
  
  
  
  static
    WORD xname_sum (		/* Get check sum (to be used as hash) of the name */
                    const WCHAR* name	/* File name to be calculated */
                      )
    {
      WCHAR chr;
      WORD sum = 0;
      
      
      while ((chr = *name++) != 0) {
        chr = (WCHAR)ff_wtoupper(chr);		/* File name needs to be upper-case converted */
        sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + (chr & 0xFF);
        sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + (chr >> 8);
      }
      return sum;
    }
  
  
#if !FF_FS_READONLY && FF_USE_MKFS
  static
    DWORD xsum32 (
                  BYTE  dat,	/* Byte to be calculated */
                  DWORD sum	/* Previous sum */
                    )
    {
      sum = ((sum & 1) ? 0x80000000 : 0) + (sum >> 1) + dat;
      return sum;
    }
#endif
  
  
#if FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2
  /*------------------------------------------------------*/
  /* exFAT: Get object information from a directory block */
  /*------------------------------------------------------*/
  
  static
    void get_xfileinfo (
                        BYTE* dirb,			/* Pointer to the direcotry entry block 85+C0+C1s */
                        FILINFO* fno		/* Buffer to store the extracted file information */
                          )
    {
      WCHAR wc, hs;
      UINT di, si, nc;
      
      /* Get file name from the entry block */
      si = SZDIRE * 2;	/* 1st C1 entry */
      nc = hs = di = 0;
      while (nc < dirb[XDIR_NumName]) {
        if (si >= MAXDIRB(FF_MAX_LFN)) { di = 0; break; }	/* Truncated directory block? */
        if ((si % SZDIRE) == 0) si += 2;		/* Skip entry type field */
        wc = ld_word(dirb + si); si += 2; nc++;	/* Get a character */
        if (hs == 0 && IsSurrogate(wc)) {	/* Is it a surrogate? */
          hs = wc; continue;	/* Get low surrogate */
        }
        wc = put_utf((DWORD)hs << 16 | wc, &fno->fname[di], FF_LFN_BUF - di);	/* Store it in UTF-16 or UTF-8 encoding */
        if (wc == 0) { di = 0; break; }	/* Buffer overflow or wrong encoding? */
        di += wc;
        hs = 0;
      }
      if (hs != 0) di = 0;					/* Broken surrogate pair? */
      if (di == 0) fno->fname[di++] = '?';	/* Inaccessible object name? */
      fno->fname[di] = 0;						/* Terminate the name */
      fno->altname[0] = 0;					/* exFAT does not have SFN */
      
      fno->fattrib = dirb[XDIR_Attr];			/* Attribute */
      fno->fsize = (fno->fattrib & AM_DIR) ? 0 : ld_qword(dirb + XDIR_FileSize);	/* Size */
      fno->ftime = ld_word(dirb + XDIR_ModTime + 0);	/* Time */
      fno->fdate = ld_word(dirb + XDIR_ModTime + 2);	/* Date */
    }
  
#endif	/* FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 */
  
  
  /*-----------------------------------*/
  /* exFAT: Get a directry entry block */
  /*-----------------------------------*/
  
  static
    FRESULT load_xdir (	/* FR_INT_ERR: invalid entry block */
                       DIR* dp			/* Reading direcotry object pointing top of the entry block to load */
                         )
    {
      FRESULT res;
      UINT i, sz_ent;
      BYTE* dirb = dp->obj.fs->dirbuf;	/* Pointer to the on-memory direcotry entry block 85+C0+C1s */
      
      
      /* Load 85 entry */
      res = move_window(dp->obj.fs, dp->sect);
      if (res != FR_OK) return res;
      if (dp->dir[XDIR_Type] != 0x85) return FR_INT_ERR;	/* Invalid order */
      mem_cpy(dirb + 0 * SZDIRE, dp->dir, SZDIRE);
      sz_ent = (dirb[XDIR_NumSec] + 1) * SZDIRE;
      if (sz_ent < 3 * SZDIRE || sz_ent > 19 * SZDIRE) return FR_INT_ERR;
      
      /* Load C0 entry */
      res = dir_next(dp, 0);
      if (res == FR_NO_FILE) res = FR_INT_ERR;	/* It cannot be */
      if (res != FR_OK) return res;
      res = move_window(dp->obj.fs, dp->sect);
      if (res != FR_OK) return res;
      if (dp->dir[XDIR_Type] != 0xC0) return FR_INT_ERR;	/* Invalid order */
      mem_cpy(dirb + 1 * SZDIRE, dp->dir, SZDIRE);
      if (MAXDIRB(dirb[XDIR_NumName]) > sz_ent) return FR_INT_ERR;
      
      /* Load C1 entries */
      i = 2 * SZDIRE;	/* C1 offset to load */
      do {
        res = dir_next(dp, 0);
        if (res == FR_NO_FILE) res = FR_INT_ERR;	/* It cannot be */
        if (res != FR_OK) return res;
        res = move_window(dp->obj.fs, dp->sect);
        if (res != FR_OK) return res;
        if (dp->dir[XDIR_Type] != 0xC1) return FR_INT_ERR;	/* Invalid order */
        if (i < MAXDIRB(FF_MAX_LFN)) mem_cpy(dirb + i, dp->dir, SZDIRE);
      } while ((i += SZDIRE) < sz_ent);
      
      /* Sanity check (do it for only accessible object) */
      if (i <= MAXDIRB(FF_MAX_LFN)) {
        if (xdir_sum(dirb) != ld_word(dirb + XDIR_SetSum)) return FR_INT_ERR;
      }
      return FR_OK;
    }
  
  
  /*------------------------------------------------------------------*/
  /* exFAT: Initialize object allocation info with loaded entry block */
  /*------------------------------------------------------------------*/
  
  static
    void init_alloc_info (
                          FATFS* fs,		/* Filesystem object */
                          FFOBJID* obj	/* Object allocation information to be initialized */
                            )
    {
      obj->sclust = ld_dword(fs->dirbuf + XDIR_FstClus);		/* Start cluster */
      obj->objsize = ld_qword(fs->dirbuf + XDIR_FileSize);	/* Size */
      obj->stat = fs->dirbuf[XDIR_GenFlags] & 2;				/* Allocation status */
      obj->n_frag = 0;										/* No last fragment info */
    }
  
  
  
#if !FF_FS_READONLY || FF_FS_RPATH != 0
  /*------------------------------------------------*/
  /* exFAT: Load the object's directory entry block */
  /*------------------------------------------------*/
  static
    FRESULT load_obj_xdir (	
                           DIR* dp,			/* Blank directory object to be used to access containing direcotry */
                           const FFOBJID* obj	/* Object with its containing directory information */
                             )
    {
      FRESULT res;
      
      /* Open object containing directory */
      dp->obj.fs = obj->fs;
      dp->obj.sclust = obj->c_scl;
      dp->obj.stat = (BYTE)obj->c_size;
      dp->obj.objsize = obj->c_size & 0xFFFFFF00;
      dp->obj.n_frag = 0;
      dp->blk_ofs = obj->c_ofs;
      
      res = dir_sdi(dp, dp->blk_ofs);	/* Goto object's entry block */
      if (res == FR_OK) {
        res = load_xdir(dp);		/* Load the object's entry block */
      }
      return res;
    }
#endif
  
  
#if !FF_FS_READONLY
  /*----------------------------------------*/
  /* exFAT: Store the directory entry block */
  /*----------------------------------------*/
  static
    FRESULT store_xdir (
                        DIR* dp				/* Pointer to the direcotry object */
                          )
    {
      FRESULT res;
      UINT nent;
      BYTE* dirb = dp->obj.fs->dirbuf;	/* Pointer to the direcotry entry block 85+C0+C1s */
      
      /* Create set sum */
      st_word(dirb + XDIR_SetSum, xdir_sum(dirb));
      nent = dirb[XDIR_NumSec] + 1;
      
      /* Store the direcotry entry block to the directory */
      res = dir_sdi(dp, dp->blk_ofs);
      while (res == FR_OK) {
        res = move_window(dp->obj.fs, dp->sect);
        if (res != FR_OK) break;
        mem_cpy(dp->dir, dirb, SZDIRE);
        dp->obj.fs->wflag = 1;
        if (--nent == 0) break;
        dirb += SZDIRE;
        res = dir_next(dp, 0);
      }
      return (res == FR_OK || res == FR_DISK_ERR) ? res : FR_INT_ERR;
    }
  
  
  
  /*-------------------------------------------*/
  /* exFAT: Create a new directory enrty block */
  /*-------------------------------------------*/
  
  static
    void create_xdir (
                      BYTE* dirb,			/* Pointer to the direcotry entry block buffer */
                      const WCHAR* lfn	/* Pointer to the object name */
                        )
    {
      UINT i;
      BYTE nc1, nlen;
      WCHAR wc;
      
      
      /* Create 85,C0 entry */
      mem_set(dirb, 0, 2 * SZDIRE);
      dirb[0 * SZDIRE + XDIR_Type] = 0x85;	/* 85 entry */
      dirb[1 * SZDIRE + XDIR_Type] = 0xC0;	/* C0 entry */
      
      /* Create C1 entries */
      i = SZDIRE * 2;	/* Top of C1 entries */
      nlen = nc1 = 0; wc = 1;
      do {
        dirb[i++] = 0xC1; dirb[i++] = 0;	/* Entry type C1 */
        do {	/* Fill name field */
          if (wc != 0 && (wc = lfn[nlen]) != 0) nlen++;	/* Get a character if exist */
          st_word(dirb + i, wc); 		/* Store it */
          i += 2;
        } while (i % SZDIRE != 0);
        nc1++;
      } while (lfn[nlen]);	/* Fill next entry if any char follows */
      
      dirb[XDIR_NumName] = nlen;		/* Set name length */
      dirb[XDIR_NumSec] = 1 + nc1;	/* Set secondary count (C0 + C1s) */
      st_word(dirb + XDIR_NameHash, xname_sum(lfn));	/* Set name hash */
    }
  
#endif	/* !FF_FS_READONLY */
#endif	/* FF_FS_EXFAT */
  
  
  
#if FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 || FF_USE_LABEL || FF_FS_EXFAT
  /*-----------------------------------------------------------------------*/
  /* Read an object from the directory                                     */
  /*-----------------------------------------------------------------------*/
  
#define dir_read_file(dp) dir_read(dp, 0)
#define dir_read_label(dp) dir_read(dp, 1)
  
  static
    FRESULT dir_read (
                      DIR* dp,		/* Pointer to the directory object */
                      int vol			/* Filtered by 0:file/directory or 1:volume label */
                        )
    {
      FRESULT res = FR_NO_FILE;
      FATFS *fs = dp->obj.fs;
      BYTE a, c;
#if FF_USE_LFN
      BYTE ord = 0xFF, sum = 0xFF;
#endif
      
      while (dp->sect) {
        res = move_window(fs, dp->sect);
        if (res != FR_OK) break;
        c = dp->dir[DIR_Name];	/* Test for the entry type */
        if (c == 0) {
          res = FR_NO_FILE; break; /* Reached to end of the directory */
        }
#if FF_FS_EXFAT
        if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
          if (FF_USE_LABEL && vol) {
            if (c == 0x83) break;	/* Volume label entry? */
          } else {
            if (c == 0x85) {		/* Start of the file entry block? */
              dp->blk_ofs = dp->dptr;	/* Get location of the block */
              res = load_xdir(dp);	/* Load the entry block */
              if (res == FR_OK) {
                dp->obj.attr = fs->dirbuf[XDIR_Attr] & AM_MASK;	/* Get attribute */
              }
              break;
            }
          }
        } else
#endif
        {	/* On the FAT/FAT32 volume */
          dp->obj.attr = a = dp->dir[DIR_Attr] & AM_MASK;	/* Get attribute */
#if FF_USE_LFN		/* LFN configuration */
          if (c == DDEM || c == '.' || (int)((a & ~AM_ARC) == AM_VOL) != vol) {	/* An entry without valid data */
            ord = 0xFF;
          } else {
            if (a == AM_LFN) {			/* An LFN entry is found */
              if (c & LLEF) {			/* Is it start of an LFN sequence? */
                sum = dp->dir[LDIR_Chksum];
                c &= (BYTE)~LLEF; ord = c;
                dp->blk_ofs = dp->dptr;
              }
              /* Check LFN validity and capture it */
              ord = (c == ord && sum == dp->dir[LDIR_Chksum] && pick_lfn(fs->lfnbuf, dp->dir)) ? ord - 1 : 0xFF;
            } else {					/* An SFN entry is found */
              if (ord != 0 || sum != sum_sfn(dp->dir)) {	/* Is there a valid LFN? */
                dp->blk_ofs = 0xFFFFFFFF;			/* It has no LFN. */
              }
              break;
            }
          }
#else		/* Non LFN configuration */
          if (c != DDEM && c != '.' && a != AM_LFN && (int)((a & ~AM_ARC) == AM_VOL) == vol) {	/* Is it a valid entry? */
            break;
          }
#endif
        }
        res = dir_next(dp, 0);		/* Next entry */
        if (res != FR_OK) break;
      }
      
      if (res != FR_OK) dp->sect = 0;		/* Terminate the read operation on error or EOT */
      return res;
    }
  
#endif	/* FF_FS_MINIMIZE <= 1 || FF_USE_LABEL || FF_FS_RPATH >= 2 */
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Directory handling - Find an object in the directory                  */
  /*-----------------------------------------------------------------------*/
  
  static
    FRESULT dir_find (	/* FR_OK(0):succeeded, !=0:error */
                      DIR* dp			/* Pointer to the directory object with the file name */
                        )
    {
      FRESULT res;
      FATFS *fs = dp->obj.fs;
      BYTE c;
#if FF_USE_LFN
      BYTE a, ord, sum;
#endif
      
      res = dir_sdi(dp, 0);			/* Rewind directory object */
      if (res != FR_OK) return res;
#if FF_FS_EXFAT
      if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
        BYTE nc;
        UINT di, ni;
        WORD hash = xname_sum(fs->lfnbuf);		/* Hash value of the name to find */
        
        while ((res = dir_read_file(dp)) == FR_OK) {	/* Read an item */
#if FF_MAX_LFN < 255
          if (fs->dirbuf[XDIR_NumName] > FF_MAX_LFN) continue;			/* Skip comparison if inaccessible object name */
#endif
          if (ld_word(fs->dirbuf + XDIR_NameHash) != hash) continue;	/* Skip comparison if hash mismatched */
          for (nc = fs->dirbuf[XDIR_NumName], di = SZDIRE * 2, ni = 0; nc; nc--, di += 2, ni++) {	/* Compare the name */
            if ((di % SZDIRE) == 0) di += 2;
            if (ff_wtoupper(ld_word(fs->dirbuf + di)) != ff_wtoupper(fs->lfnbuf[ni])) break;
          }
          if (nc == 0 && !fs->lfnbuf[ni]) break;	/* Name matched? */
        }
        return res;
      }
#endif
      /* On the FAT/FAT32 volume */
#if FF_USE_LFN
      ord = sum = 0xFF; dp->blk_ofs = 0xFFFFFFFF;	/* Reset LFN sequence */
#endif
      do {
        res = move_window(fs, dp->sect);
        if (res != FR_OK) break;
        c = dp->dir[DIR_Name];
        if (c == 0) { res = FR_NO_FILE; break; }	/* Reached to end of table */
#if FF_USE_LFN		/* LFN configuration */
        dp->obj.attr = a = dp->dir[DIR_Attr] & AM_MASK;
        if (c == DDEM || ((a & AM_VOL) && a != AM_LFN)) {	/* An entry without valid data */
          ord = 0xFF; dp->blk_ofs = 0xFFFFFFFF;	/* Reset LFN sequence */
        } else {
          if (a == AM_LFN) {			/* An LFN entry is found */
            if (!(dp->fn[NSFLAG] & NS_NOLFN)) {
              if (c & LLEF) {		/* Is it start of LFN sequence? */
                sum = dp->dir[LDIR_Chksum];
                c &= (BYTE)~LLEF; ord = c;	/* LFN start order */
                dp->blk_ofs = dp->dptr;	/* Start offset of LFN */
              }
              /* Check validity of the LFN entry and compare it with given name */
              ord = (c == ord && sum == dp->dir[LDIR_Chksum] && cmp_lfn(fs->lfnbuf, dp->dir)) ? ord - 1 : 0xFF;
            }
          } else {					/* An SFN entry is found */
            if (ord == 0 && sum == sum_sfn(dp->dir)) break;	/* LFN matched? */
            if (!(dp->fn[NSFLAG] & NS_LOSS) && !mem_cmp(dp->dir, dp->fn, 11)) break;	/* SFN matched? */
            ord = 0xFF; dp->blk_ofs = 0xFFFFFFFF;	/* Reset LFN sequence */
          }
        }
#else		/* Non LFN configuration */
        dp->obj.attr = dp->dir[DIR_Attr] & AM_MASK;
        if (!(dp->dir[DIR_Attr] & AM_VOL) && !mem_cmp(dp->dir, dp->fn, 11)) break;	/* Is it a valid entry? */
#endif
        res = dir_next(dp, 0);	/* Next entry */
      } while (res == FR_OK);
      
      return res;
    }
  
  
  
  
#if !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* Register an object to the directory                                   */
  /*-----------------------------------------------------------------------*/
  
  static
    FRESULT dir_register (	/* FR_OK:succeeded, FR_DENIED:no free entry or too many SFN collision, FR_DISK_ERR:disk error */
                          DIR* dp				/* Target directory with object name to be created */
                            )
    {
      FRESULT res;
      FATFS *fs = dp->obj.fs;
#if FF_USE_LFN		/* LFN configuration */
      UINT n, nlen, nent;
      BYTE sn[12], sum;
      
      
      if (dp->fn[NSFLAG] & (NS_DOT | NS_NONAME)) return FR_INVALID_NAME;	/* Check name validity */
      for (nlen = 0; fs->lfnbuf[nlen]; nlen++) ;	/* Get lfn length */
      
#if FF_FS_EXFAT
      if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
        nent = (nlen + 14) / 15 + 2;	/* Number of entries to allocate (85+C0+C1s) */
        res = dir_alloc(dp, nent);		/* Allocate entries */
        if (res != FR_OK) return res;
        dp->blk_ofs = dp->dptr - SZDIRE * (nent - 1);	/* Set the allocated entry block offset */
        
        if (dp->obj.stat & 4) {			/* Has the directory been stretched? */
          dp->obj.stat &= ~4;
          res = fill_first_frag(&dp->obj);	/* Fill the first fragment on the FAT if needed */
          if (res != FR_OK) return res;
          res = fill_last_frag(&dp->obj, dp->clust, 0xFFFFFFFF);	/* Fill the last fragment on the FAT if needed */
          if (res != FR_OK) return res;
          if (dp->obj.sclust != 0) {		/* Is it a sub directory? */
            DIR dj;
            
            res = load_obj_xdir(&dj, &dp->obj);	/* Load the object status */
            if (res != FR_OK) return res;
            dp->obj.objsize += (DWORD)fs->csize * SS(fs);			/* Increase the directory size by cluster size */
            st_qword(fs->dirbuf + XDIR_FileSize, dp->obj.objsize);	/* Update the allocation status */
            st_qword(fs->dirbuf + XDIR_ValidFileSize, dp->obj.objsize);
            fs->dirbuf[XDIR_GenFlags] = dp->obj.stat | 1;
            res = store_xdir(&dj);				/* Store the object status */
            if (res != FR_OK) return res;
          }
        }
        
        create_xdir(fs->dirbuf, fs->lfnbuf);	/* Create on-memory directory block to be written later */
        return FR_OK;
      }
#endif
      /* On the FAT/FAT32 volume */
      mem_cpy(sn, dp->fn, 12);
      if (sn[NSFLAG] & NS_LOSS) {			/* When LFN is out of 8.3 format, generate a numbered name */
        dp->fn[NSFLAG] = NS_NOLFN;		/* Find only SFN */
        for (n = 1; n < 100; n++) {
          gen_numname(dp->fn, sn, fs->lfnbuf, n);	/* Generate a numbered name */
          res = dir_find(dp);				/* Check if the name collides with existing SFN */
          if (res != FR_OK) break;
        }
        if (n == 100) return FR_DENIED;		/* Abort if too many collisions */
        if (res != FR_NO_FILE) return res;	/* Abort if the result is other than 'not collided' */
        dp->fn[NSFLAG] = sn[NSFLAG];
      }
      
      /* Create an SFN with/without LFNs. */
      nent = (sn[NSFLAG] & NS_LFN) ? (nlen + 12) / 13 + 1 : 1;	/* Number of entries to allocate */
      res = dir_alloc(dp, nent);		/* Allocate entries */
      if (res == FR_OK && --nent) {	/* Set LFN entry if needed */
        res = dir_sdi(dp, dp->dptr - nent * SZDIRE);
        if (res == FR_OK) {
          sum = sum_sfn(dp->fn);	/* Checksum value of the SFN tied to the LFN */
          do {					/* Store LFN entries in bottom first */
            res = move_window(fs, dp->sect);
            if (res != FR_OK) break;
            put_lfn(fs->lfnbuf, dp->dir, (BYTE)nent, sum);
            fs->wflag = 1;
            res = dir_next(dp, 0);	/* Next entry */
          } while (res == FR_OK && --nent);
        }
      }
      
#else	/* Non LFN configuration */
      res = dir_alloc(dp, 1);		/* Allocate an entry for SFN */
      
#endif
      
      /* Set SFN entry */
      if (res == FR_OK) {
        res = move_window(fs, dp->sect);
        if (res == FR_OK) {
          mem_set(dp->dir, 0, SZDIRE);	/* Clean the entry */
          mem_cpy(dp->dir + DIR_Name, dp->fn, 11);	/* Put SFN */
#if FF_USE_LFN
          dp->dir[DIR_NTres] = dp->fn[NSFLAG] & (NS_BODY | NS_EXT);	/* Put NT flag */
#endif
          fs->wflag = 1;
        }
      }
      
      return res;
    }
  
#endif /* !FF_FS_READONLY */
  
  
  
#if !FF_FS_READONLY && FF_FS_MINIMIZE == 0
  /*-----------------------------------------------------------------------*/
  /* Remove an object from the directory                                   */
  /*-----------------------------------------------------------------------*/
  
  static
    FRESULT dir_remove (	/* FR_OK:Succeeded, FR_DISK_ERR:A disk error */
                        DIR* dp				/* Directory object pointing the entry to be removed */
                          )
    {
      FRESULT res;
      FATFS *fs = dp->obj.fs;
#if FF_USE_LFN		/* LFN configuration */
      DWORD last = dp->dptr;
      
      res = (dp->blk_ofs == 0xFFFFFFFF) ? FR_OK : dir_sdi(dp, dp->blk_ofs);	/* Goto top of the entry block if LFN is exist */
      if (res == FR_OK) {
        do {
          res = move_window(fs, dp->sect);
          if (res != FR_OK) break;
          if (FF_FS_EXFAT && fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
            dp->dir[XDIR_Type] &= 0x7F;	/* Clear the entry InUse flag. */
          } else {									/* On the FAT/FAT32 volume */
            dp->dir[DIR_Name] = DDEM;	/* Mark the entry 'deleted'. */
          }
          fs->wflag = 1;
          if (dp->dptr >= last) break;	/* If reached last entry then all entries of the object has been deleted. */
          res = dir_next(dp, 0);	/* Next entry */
        } while (res == FR_OK);
        if (res == FR_NO_FILE) res = FR_INT_ERR;
      }
#else			/* Non LFN configuration */
      
      res = move_window(fs, dp->sect);
      if (res == FR_OK) {
        dp->dir[DIR_Name] = DDEM;	/* Mark the entry 'deleted'.*/
        fs->wflag = 1;
      }
#endif
      
      return res;
    }
  
#endif /* !FF_FS_READONLY && FF_FS_MINIMIZE == 0 */
  
  
  
#if FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2
  /*-----------------------------------------------------------------------*/
  /* Get file information from directory entry                             */
  /*-----------------------------------------------------------------------*/
  
  static
    void get_fileinfo (
                       DIR* dp,		/* Pointer to the directory object */
                       FILINFO* fno	/* Pointer to the file information to be filled */
                         )
    {
      UINT si, di;
#if FF_USE_LFN
      WCHAR wc, hs;
      FATFS *fs = dp->obj.fs;
#else
      TCHAR c;
#endif
      
      
      fno->fname[0] = 0;			/* Invaidate file info */
      if (dp->sect == 0) return;	/* Exit if read pointer has reached end of directory */
      
#if FF_USE_LFN		/* LFN configuration */
#if FF_FS_EXFAT
      if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
        get_xfileinfo(fs->dirbuf, fno);
        return;
      } else
#endif
      {	/* On the FAT/FAT32 volume */
        if (dp->blk_ofs != 0xFFFFFFFF) {	/* Get LFN if available */
          si = di = hs = 0;
          while (fs->lfnbuf[si] != 0) {
            wc = fs->lfnbuf[si++];		/* Get an LFN character (UTF-16) */
            if (hs == 0 && IsSurrogate(wc)) {	/* Is it a surrogate? */
              hs = wc; continue;		/* Get low surrogate */
            }
            wc = put_utf((DWORD)hs << 16 | wc, &fno->fname[di], FF_LFN_BUF - di);	/* Store it in UTF-16 or UTF-8 encoding */
            if (wc == 0) { di = 0; break; }	/* Invalid char or buffer overflow? */
            di += wc;
            hs = 0;
          }
          if (hs != 0) di = 0;	/* Broken surrogate pair? */
          fno->fname[di] = 0;		/* Terminate the LFN (null string means LFN is invalid) */
        }
      }
      
      si = di = 0;
      while (si < 11) {		/* Get SFN from SFN entry */
        wc = dp->dir[si++];			/* Get a char */
        if (wc == ' ') continue;	/* Skip padding spaces */
        if (wc == RDDEM) wc = DDEM;	/* Restore replaced DDEM character */
        if (si == 9 && di < FF_SFN_BUF) fno->altname[di++] = '.';	/* Insert a . if extension is exist */
#if FF_LFN_UNICODE >= 1	/* Unicode output */
        if (dbc_1st((BYTE)wc) && si != 8 && si != 11 && dbc_2nd(dp->dir[si])) {	/* Make a DBC if needed */
          wc = wc << 8 | dp->dir[si++];
        }
        wc = ff_oem2uni(wc, CODEPAGE);		/* ANSI/OEM -> Unicode */
        if (wc == 0) { di = 0; break; }		/* Wrong char in the current code page? */
        wc = put_utf(wc, &fno->altname[di], FF_SFN_BUF - di);	/* Store it in UTF-16 or UTF-8 */
        if (wc == 0) { di = 0; break; }		/* Buffer overflow? */
        di += wc;
#else					/* ANSI/OEM output */
        fno->altname[di++] = (TCHAR)wc;	/* Store it without any conversion */
#endif
      }
      fno->altname[di] = 0;	/* Terminate the SFN  (null string means SFN is invalid) */
      
      if (fno->fname[0] == 0) {	/* If LFN is invalid, altname[] needs to be copied to fname[] */
        if (di == 0) {	/* If LFN and SFN both are invalid, this object is inaccesible */
          fno->fname[di++] = '?';
        } else {
          for (si = di = 0; fno->altname[si]; si++, di++) {	/* Copy altname[] to fname[] with case information */
            wc = (WCHAR)fno->altname[si];
            if (IsUpper(wc) && (dp->dir[DIR_NTres] & ((si >= 9) ? NS_EXT : NS_BODY))) wc += 0x20;
            fno->fname[di] = (TCHAR)wc;
          }
        }
        fno->fname[di] = 0;	/* Terminate the LFN */
        if (!dp->dir[DIR_NTres]) fno->altname[0] = 0;	/* Altname is not needed if neither LFN nor case info is exist. */
      }
      
#else	/* Non-LFN configuration */
      si = di = 0;
      while (si < 11) {		/* Copy name body and extension */
        c = (TCHAR)dp->dir[si++];
        if (c == ' ') continue;		/* Skip padding spaces */
        if (c == RDDEM) c = DDEM;	/* Restore replaced DDEM character */
        if (si == 9) fno->fname[di++] = '.';/* Insert a . if extension is exist */
        fno->fname[di++] = c;
      }
      fno->fname[di] = 0;
#endif
      
      fno->fattrib = dp->dir[DIR_Attr];					/* Attribute */
      fno->fsize = ld_dword(dp->dir + DIR_FileSize);		/* Size */
      fno->ftime = ld_word(dp->dir + DIR_ModTime + 0);	/* Time */
      fno->fdate = ld_word(dp->dir + DIR_ModTime + 2);	/* Date */
    }
  
#endif /* FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 */
  
  
  
#if FF_USE_FIND && FF_FS_MINIMIZE <= 1
  /*-----------------------------------------------------------------------*/
  /* Pattern matching                                                      */
  /*-----------------------------------------------------------------------*/
  
  static
    DWORD get_achar (		/* Get a character and advances ptr */
                     const TCHAR** ptr	/* Pointer to pointer to the ANSI/OEM or Unicode string */
                       )
    {
      DWORD chr;
      
      
#if FF_USE_LFN && FF_LFN_UNICODE >= 1	/* Unicode input */
      chr = tchar2uni(ptr);
      if (chr == 0xFFFFFFFF) chr = 0;		/* Wrong UTF encoding is recognized as end of the string */
      chr = ff_wtoupper(chr);
      
#else									/* ANSI/OEM input */
      chr = (BYTE)*(*ptr)++;				/* Get a byte */
      if (IsLower(chr)) chr -= 0x20;		/* To upper ASCII char */
#if FF_CODE_PAGE == 0
      if (ExCvt && chr >= 0x80) chr = ExCvt[chr - 0x80];	/* To upper SBCS extended char */
#elif FF_CODE_PAGE < 900
      if (chr >= 0x80) chr = ExCvt[chr - 0x80];	/* To upper SBCS extended char */
#endif
#if FF_CODE_PAGE == 0 || FF_CODE_PAGE >= 900
      if (dbc_1st((BYTE)chr)) {	/* Get DBC 2nd byte if needed */
        chr = dbc_2nd((BYTE)**ptr) ? chr << 8 | (BYTE)*(*ptr)++ : 0;
      }
#endif
      
#endif
      return chr;
    }
  
  
  static
    int pattern_matching (	/* 0:not matched, 1:matched */
                          const TCHAR* pat,	/* Matching pattern */
                          const TCHAR* nam,	/* String to be tested */
                          int skip,			/* Number of pre-skip chars (number of ?s) */
                          int inf				/* Infinite search (* specified) */
                            )
    {
      const TCHAR *pp, *np;
      DWORD pc, nc;
      int nm, nx;
      
      
      while (skip--) {				/* Pre-skip name chars */
        if (!get_achar(&nam)) return 0;	/* Branch mismatched if less name chars */
      }
      if (*pat == 0 && inf) return 1;	/* (short circuit) */
      
      do {
        pp = pat; np = nam;			/* Top of pattern and name to match */
        for (;;) {
          if (*pp == '?' || *pp == '*') {	/* Wildcard? */
            nm = nx = 0;
            do {				/* Analyze the wildcard block */
              if (*pp++ == '?') nm++; else nx = 1;
            } while (*pp == '?' || *pp == '*');
            if (pattern_matching(pp, np, nm, nx)) return 1;	/* Test new branch (recurs upto number of wildcard blocks in the pattern) */
            nc = *np; break;	/* Branch mismatched */
          }
          pc = get_achar(&pp);	/* Get a pattern char */
          nc = get_achar(&np);	/* Get a name char */
          if (pc != nc) break;	/* Branch mismatched? */
          if (pc == 0) return 1;	/* Branch matched? (matched at end of both strings) */
        }
        get_achar(&nam);			/* nam++ */
      } while (inf && nc);			/* Retry until end of name if infinite search is specified */
      
      return 0;
    }
  
#endif /* FF_USE_FIND && FF_FS_MINIMIZE <= 1 */
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Pick a top segment and create the object name in directory form       */
  /*-----------------------------------------------------------------------*/
  
  static
    FRESULT create_name (	/* FR_OK: successful, FR_INVALID_NAME: could not create */
                         DIR* dp,			/* Pointer to the directory object */
                         const TCHAR** path	/* Pointer to pointer to the segment in the path string */
                           )
    {
#if FF_USE_LFN		/* LFN configuration */
      BYTE b, cf;
      WCHAR wc, *lfn;
      DWORD uc;
      UINT i, ni, si, di;
      const TCHAR *p;
      
      
      /* Create LFN into LFN working buffer */
      p = *path; lfn = dp->obj.fs->lfnbuf; di = 0;
      for (;;) {
        uc = tchar2uni(&p);			/* Get a character */
        if (uc == 0xFFFFFFFF) return FR_INVALID_NAME;		/* Invalid code or UTF decode error */
        if (uc >= 0x10000) lfn[di++] = (WCHAR)(uc >> 16);	/* Store high surrogate if needed */
        wc = (WCHAR)uc;
        if (wc < ' ' || wc == '/' || wc == '\\') break;	/* Break if end of the path or a separator is found */
        if (wc < 0x80 && chk_chr("\"*:<>\?|\x7F", wc)) return FR_INVALID_NAME;	/* Reject illegal characters for LFN */
        if (di >= FF_MAX_LFN) return FR_INVALID_NAME;	/* Reject too long name */
        lfn[di++] = wc;					/* Store the Unicode character */
      }
      while (*p == '/' || *p == '\\') p++;	/* Skip duplicated separators if exist */
      *path = p;							/* Return pointer to the next segment */
      cf = (wc < ' ') ? NS_LAST : 0;		/* Set last segment flag if end of the path */
      
#if FF_FS_RPATH != 0
      if ((di == 1 && lfn[di - 1] == '.') ||
          (di == 2 && lfn[di - 1] == '.' && lfn[di - 2] == '.')) {	/* Is this segment a dot name? */
            lfn[di] = 0;
            for (i = 0; i < 11; i++) {		/* Create dot name for SFN entry */
              dp->fn[i] = (i < di) ? '.' : ' ';
            }
            dp->fn[i] = cf | NS_DOT;		/* This is a dot entry */
            return FR_OK;
          }
#endif
      while (di) {						/* Snip off trailing spaces and dots if exist */
        wc = lfn[di - 1];
        if (wc != ' ' && wc != '.') break;
        di--;
      }
      lfn[di] = 0;							/* LFN is created into the working buffer */
      if (di == 0) return FR_INVALID_NAME;	/* Reject null name */
      
      /* Create SFN in directory form */
      for (si = 0; lfn[si] == ' '; si++) ;	/* Remove leading spaces */
      if (si > 0 || lfn[si] == '.') cf |= NS_LOSS | NS_LFN;	/* Is there any leading space or dot? */
      while (di > 0 && lfn[di - 1] != '.') di--;	/* Find last dot (di<=si: no extension) */
      
      mem_set(dp->fn, ' ', 11);
      i = b = 0; ni = 8;
      for (;;) {
        wc = lfn[si++];					/* Get an LFN character */
        if (wc == 0) break;				/* Break on end of the LFN */
        if (wc == ' ' || (wc == '.' && si != di)) {	/* Remove embedded spaces and dots */
          cf |= NS_LOSS | NS_LFN;
          continue;
        }
        
        if (i >= ni || si == di) {		/* End of field? */
          if (ni == 11) {				/* Name extension overflow? */
            cf |= NS_LOSS | NS_LFN;
            break;
          }
          if (si != di) cf |= NS_LOSS | NS_LFN;	/* Name body overflow? */
          if (si > di) break;						/* No name extension? */
          si = di; i = 8; ni = 11; b <<= 2;		/* Enter name extension */
          continue;
        }
        
        if (wc >= 0x80) {	/* Is this a non-ASCII character? */
          cf |= NS_LFN;	/* LFN entry needs to be created */
#if FF_CODE_PAGE == 0
          if (ExCvt) {	/* At SBCS */
            wc = ff_uni2oem(wc, CODEPAGE);			/* Unicode ==> ANSI/OEM code */
            if (wc & 0x80) wc = ExCvt[wc & 0x7F];	/* Convert extended character to upper (SBCS) */
          } else {		/* At DBCS */
            wc = ff_uni2oem(ff_wtoupper(wc), CODEPAGE);	/* Unicode ==> Upper convert ==> ANSI/OEM code */
          }
#elif FF_CODE_PAGE < 900	/* SBCS cfg */
          wc = ff_uni2oem(wc, CODEPAGE);			/* Unicode ==> ANSI/OEM code */
          if (wc & 0x80) wc = ExCvt[wc & 0x7F];	/* Convert extended character to upper (SBCS) */
#else						/* DBCS cfg */
          wc = ff_uni2oem(ff_wtoupper(wc), CODEPAGE);	/* Unicode ==> Upper convert ==> ANSI/OEM code */
#endif
        }
        
        if (wc >= 0x100) {				/* Is this a DBC? */
          if (i >= ni - 1) {			/* Field overflow? */
            cf |= NS_LOSS | NS_LFN;
            i = ni; continue;		/* Next field */
          }
          dp->fn[i++] = (BYTE)(wc >> 8);	/* Put 1st byte */
        } else {						/* SBC */
          if (wc == 0 || chk_chr("+,;=[]", wc)) {	/* Replace illegal characters for SFN if needed */
            wc = '_'; cf |= NS_LOSS | NS_LFN;/* Lossy conversion */
          } else {
            if (IsUpper(wc)) {		/* ASCII upper case? */
              b |= 2;
            }
            if (IsLower(wc)) {		/* ASCII lower case? */
              b |= 1; wc -= 0x20;
            }
          }
        }
        dp->fn[i++] = (BYTE)wc;
      }
      
      if (dp->fn[0] == DDEM) dp->fn[0] = RDDEM;	/* If the first character collides with DDEM, replace it with RDDEM */
      
      if (ni == 8) b <<= 2;				/* Shift capital flags if no extension */
      if ((b & 0x0C) == 0x0C || (b & 0x03) == 0x03) cf |= NS_LFN;	/* LFN entry needs to be created if composite capitals */
      if (!(cf & NS_LFN)) {				/* When LFN is in 8.3 format without extended character, NT flags are created */
        if (b & 0x01) cf |= NS_EXT;		/* NT flag (Extension has small capital letters only) */
        if (b & 0x04) cf |= NS_BODY;	/* NT flag (Body has small capital letters only) */
      }
      
      dp->fn[NSFLAG] = cf;	/* SFN is created into dp->fn[] */
      
      return FR_OK;
      
      
#else	/* FF_USE_LFN : Non-LFN configuration */
      BYTE c, d, *sfn;
      UINT ni, si, i;
      const char *p;
      
      /* Create file name in directory form */
      p = *path; sfn = dp->fn;
      mem_set(sfn, ' ', 11);
      si = i = 0; ni = 8;
#if FF_FS_RPATH != 0
      if (p[si] == '.') { /* Is this a dot entry? */
        for (;;) {
          c = (BYTE)p[si++];
          if (c != '.' || si >= 3) break;
          sfn[i++] = c;
        }
        if (c != '/' && c != '\\' && c > ' ') return FR_INVALID_NAME;
        *path = p + si;								/* Return pointer to the next segment */
        sfn[NSFLAG] = (c <= ' ') ? NS_LAST | NS_DOT : NS_DOT;	/* Set last segment flag if end of the path */
        return FR_OK;
      }
#endif
      for (;;) {
        c = (BYTE)p[si++];				/* Get a byte */
        if (c <= ' ') break; 			/* Break if end of the path name */
        if (c == '/' || c == '\\') {	/* Break if a separator is found */
          while (p[si] == '/' || p[si] == '\\') si++;	/* Skip duplicated separator if exist */
          break;
        }
        if (c == '.' || i >= ni) {		/* End of body or field overflow? */
          if (ni == 11 || c != '.') return FR_INVALID_NAME;	/* Field overflow or invalid dot? */
          i = 8; ni = 11;				/* Enter file extension field */
          continue;
        }
#if FF_CODE_PAGE == 0
        if (ExCvt && c >= 0x80) {		/* Is SBC extended character? */
          c = ExCvt[c & 0x7F];		/* To upper SBC extended character */
        }
#elif FF_CODE_PAGE < 900
        if (c >= 0x80) {				/* Is SBC extended character? */
          c = ExCvt[c & 0x7F];		/* To upper SBC extended character */
        }
#endif
        if (dbc_1st(c)) {				/* Check if it is a DBC 1st byte */
          d = (BYTE)p[si++];			/* Get 2nd byte */
          if (!dbc_2nd(d) || i >= ni - 1) return FR_INVALID_NAME;	/* Reject invalid DBC */
          sfn[i++] = c;
          sfn[i++] = d;
        } else {						/* SBC */
          if (chk_chr("\"*+,:;<=>\?[]|\x7F", c)) return FR_INVALID_NAME;	/* Reject illegal chrs for SFN */
          if (IsLower(c)) c -= 0x20;	/* To upper */
          sfn[i++] = c;
        }
      }
      *path = p + si;						/* Return pointer to the next segment */
      if (i == 0) return FR_INVALID_NAME;	/* Reject nul string */
      
      if (sfn[0] == DDEM) sfn[0] = RDDEM;	/* If the first character collides with DDEM, replace it with RDDEM */
      sfn[NSFLAG] = (c <= ' ') ? NS_LAST : 0;		/* Set last segment flag if end of the path */
      
      return FR_OK;
#endif /* FF_USE_LFN */
    }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Follow a file path                                                    */
  /*-----------------------------------------------------------------------*/
  
  static
    FRESULT follow_path (	/* FR_OK(0): successful, !=0: error code */
                         DIR* dp,			/* Directory object to return last directory and found object */
                         const TCHAR* path	/* Full-path string to find a file or directory */
                           )
    {
      FRESULT res;
      BYTE ns;
      FATFS *fs = dp->obj.fs;
      
      
#if FF_FS_RPATH != 0
      if (*path != '/' && *path != '\\') {	/* Without heading separator */
        dp->obj.sclust = fs->cdir;				/* Start from current directory */
      } else
#endif
      {										/* With heading separator */
        while (*path == '/' || *path == '\\') path++;	/* Strip heading separator */
        dp->obj.sclust = 0;					/* Start from root directory */
      }
#if FF_FS_EXFAT
      dp->obj.n_frag = 0;	/* Invalidate last fragment counter of the object */
#if FF_FS_RPATH != 0
      if (fs->fs_type == FS_EXFAT && dp->obj.sclust) {	/* exFAT: Retrieve the sub-directory's status */
        DIR dj;
        
        dp->obj.c_scl = fs->cdc_scl;
        dp->obj.c_size = fs->cdc_size;
        dp->obj.c_ofs = fs->cdc_ofs;
        res = load_obj_xdir(&dj, &dp->obj);
        if (res != FR_OK) return res;
        dp->obj.objsize = ld_dword(fs->dirbuf + XDIR_FileSize);
        dp->obj.stat = fs->dirbuf[XDIR_GenFlags] & 2;
      }
#endif
#endif
      
      if ((UINT)*path < ' ') {				/* Null path name is the origin directory itself */
        dp->fn[NSFLAG] = NS_NONAME;
        res = dir_sdi(dp, 0);
        
      } else {								/* Follow path */
        for (;;) {
          res = create_name(dp, &path);	/* Get a segment name of the path */
          if (res != FR_OK) break;
          res = dir_find(dp);				/* Find an object with the segment name */
          ns = dp->fn[NSFLAG];
          if (res != FR_OK) {				/* Failed to find the object */
            if (res == FR_NO_FILE) {	/* Object is not found */
              if (FF_FS_RPATH && (ns & NS_DOT)) {	/* If dot entry is not exist, stay there */
                if (!(ns & NS_LAST)) continue;	/* Continue to follow if not last segment */
                dp->fn[NSFLAG] = NS_NONAME;
                res = FR_OK;
              } else {							/* Could not find the object */
                if (!(ns & NS_LAST)) res = FR_NO_PATH;	/* Adjust error code if not last segment */
              }
            }
            break;
          }
          if (ns & NS_LAST) break;			/* Last segment matched. Function completed. */
          /* Get into the sub-directory */
          if (!(dp->obj.attr & AM_DIR)) {		/* It is not a sub-directory and cannot follow */
            res = FR_NO_PATH; break;
          }
#if FF_FS_EXFAT
          if (fs->fs_type == FS_EXFAT) {		/* Save containing directory information for next dir */
            dp->obj.c_scl = dp->obj.sclust;
            dp->obj.c_size = ((DWORD)dp->obj.objsize & 0xFFFFFF00) | dp->obj.stat;
            dp->obj.c_ofs = dp->blk_ofs;
            init_alloc_info(fs, &dp->obj);	/* Open next directory */
          } else
#endif
          {
            dp->obj.sclust = ld_clust(fs, fs->win + dp->dptr % SS(fs));	/* Open next directory */
          }
        }
      }
      
      return res;
    }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Get logical drive number from path name                               */
  /*-----------------------------------------------------------------------*/
  
  static
    int get_ldnumber (		/* Returns logical drive number (-1:invalid drive) */
                      const TCHAR** path	/* Pointer to pointer to the path name */
                        )
    {
      const TCHAR *tp, *tt;
      UINT i;
      int vol = -1;
#if FF_STR_VOLUME_ID		/* Find string drive id */
      static const char* const volid[] = {FF_VOLUME_STRS};
      const char *sp;
      char c;
      TCHAR tc;
#endif
      
      
      if (*path != 0) {	/* If the pointer is not a null */
        for (tt = *path; (UINT)*tt >= (FF_USE_LFN ? ' ' : '!') && *tt != ':'; tt++) ;	/* Find a colon in the path */
        if (*tt == ':') {	/* If a colon is exist in the path name */
          tp = *path;
          i = *tp++;
          if (IsDigit(i) && tp == tt) {	/* Is there a numeric drive id + colon? */
            if ((i -= '0') < FF_VOLUMES) {	/* If drive id is found, get the value and strip it */
              vol = (int)i;
              *path = ++tt;
            }
          }
#if FF_STR_VOLUME_ID
          else {	/* No numeric drive number, find string drive id */
            i = 0; tt++;
            do {
              sp = volid[i]; tp = *path;
              do {	/* Compare a string drive id with path name */
                c = *sp++; tc = *tp++;
                if (IsLower(tc)) tc -= 0x20;
              } while (c && (TCHAR)c == tc);
            } while ((c || tp != tt) && ++i < FF_VOLUMES);	/* Repeat for each id until pattern match */
            if (i < FF_VOLUMES) {	/* If a drive id is found, get the value and strip it */
              vol = (int)i;
              *path = tt;
            }
          }
#endif
        } else {	/* No volume id and use default drive */
#if FF_FS_RPATH != 0 && FF_VOLUMES >= 2
          vol = CurrVol;	/* Current drive */
#else
          vol = 0;		/* Drive 0 */
#endif
        }
      }
      return vol;
    }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Load a sector and check if it is an FAT VBR                           */
  /*-----------------------------------------------------------------------*/
  
  static
    BYTE check_fs (	/* 0:FAT, 1:exFAT, 2:Valid BS but not FAT, 3:Not a BS, 4:Disk error */
                   FATFS* fs,	/* Filesystem object */
                   DWORD sect	/* Sector# (lba) to load and check if it is an FAT-VBR or not */
                     )
    {
      fs->wflag = 0; fs->winsect = 0xFFFFFFFF;		/* Invaidate window */
      if (move_window(fs, sect) != FR_OK) return 4;	/* Load boot record */
      
      if (ld_word(fs->win + BS_55AA) != 0xAA55) return 3;	/* Check boot record signature (always placed here even if the sector size is >512) */
      
#if FF_FS_EXFAT
      if (!mem_cmp(fs->win + BS_JmpBoot, "\xEB\x76\x90" "EXFAT   ", 11)) return 1;	/* Check if exFAT VBR */
#endif
      if (fs->win[BS_JmpBoot] == 0xE9 || fs->win[BS_JmpBoot] == 0xEB || fs->win[BS_JmpBoot] == 0xE8) {	/* Valid JumpBoot code? */
        if (!mem_cmp(fs->win + BS_FilSysType, "FAT", 3)) return 0;		/* Is it an FAT VBR? */
        if (!mem_cmp(fs->win + BS_FilSysType32, "FAT32", 5)) return 0;	/* Is it an FAT32 VBR? */
      }
      return 2;	/* Valid BS but not FAT */
    }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Determine logical drive number and mount the volume if needed         */
  /*-----------------------------------------------------------------------*/
  
  static
    FRESULT find_volume (	/* FR_OK(0): successful, !=0: any error occurred */
                         const TCHAR** path,	/* Pointer to pointer to the path name (drive number) */
                         FATFS** rfs,		/* Pointer to pointer to the found filesystem object */
                         BYTE mode			/* !=0: Check write protection for write access */
                           )
    {
      BYTE fmt, *pt;
      int vol;
      DSTATUS stat;
      DWORD bsect, fasize, tsect, sysect, nclst, szbfat, br[4];
      WORD nrsv;
      FATFS *fs;
      UINT i;
      
      
      /* Get logical drive number */
      *rfs = 0;
      vol = get_ldnumber(path);
      if (vol < 0) return FR_INVALID_DRIVE;
      
      /* Check if the filesystem object is valid or not */
      fs = FatFs[vol];					/* Get pointer to the filesystem object */
      if (!fs) return FR_NOT_ENABLED;		/* Is the filesystem object available? */
#if FF_FS_REENTRANT
      if (!lock_fs(fs)) return FR_TIMEOUT;	/* Lock the volume */
#endif
      *rfs = fs;							/* Return pointer to the filesystem object */
      
      mode &= (BYTE)~FA_READ;				/* Desired access mode, write access or not */
      if (fs->fs_type != 0) {				/* If the volume has been mounted */
        stat = disk_status(fs->pdrv);
        if (!(stat & STA_NOINIT)) {		/* and the physical drive is kept initialized */
          if (!FF_FS_READONLY && mode && (stat & STA_PROTECT)) {	/* Check write protection if needed */
            return FR_WRITE_PROTECTED;
          }
          return FR_OK;				/* The filesystem object is valid */
        }
      }
      
      /* The filesystem object is not valid. */
      /* Following code attempts to mount the volume. (analyze BPB and initialize the filesystem object) */
      
      fs->fs_type = 0;					/* Clear the filesystem object */
      fs->pdrv = LD2PD(vol);				/* Bind the logical drive and a physical drive */
      stat = disk_initialize(fs->pdrv);	/* Initialize the physical drive */
      if (stat & STA_NOINIT) { 			/* Check if the initialization succeeded */
        return FR_NOT_READY;			/* Failed to initialize due to no medium or hard error */
      }
      if (!FF_FS_READONLY && mode && (stat & STA_PROTECT)) { /* Check disk write protection if needed */
        return FR_WRITE_PROTECTED;
      }
#if FF_MAX_SS != FF_MIN_SS				/* Get sector size (multiple sector size cfg only) */
      if (disk_ioctl(fs->pdrv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK) return FR_DISK_ERR;
      if (SS(fs) > FF_MAX_SS || SS(fs) < FF_MIN_SS || (SS(fs) & (SS(fs) - 1))) return FR_DISK_ERR;
#endif
      
      /* Find an FAT partition on the drive. Supports only generic partitioning rules, FDISK and SFD. */
      bsect = 0;
      fmt = check_fs(fs, bsect);			/* Load sector 0 and check if it is an FAT-VBR as SFD */
      if (fmt == 2 || (fmt < 2 && LD2PT(vol) != 0)) {	/* Not an FAT-VBR or forced partition number */
        for (i = 0; i < 4; i++) {		/* Get partition offset */
          pt = fs->win + (MBR_Table + i * SZ_PTE);
          br[i] = pt[PTE_System] ? ld_dword(pt + PTE_StLba) : 0;
        }
        i = LD2PT(vol);					/* Partition number: 0:auto, 1-4:forced */
        if (i != 0) i--;
        do {							/* Find an FAT volume */
          bsect = br[i];
          fmt = bsect ? check_fs(fs, bsect) : 3;	/* Check the partition */
        } while (LD2PT(vol) == 0 && fmt >= 2 && ++i < 4);
      }
      if (fmt == 4) return FR_DISK_ERR;		/* An error occured in the disk I/O layer */
      if (fmt >= 2) return FR_NO_FILESYSTEM;	/* No FAT volume is found */
      
      /* An FAT volume is found (bsect). Following code initializes the filesystem object */
      
#if FF_FS_EXFAT
      if (fmt == 1) {
        QWORD maxlba;
        
        for (i = BPB_ZeroedEx; i < BPB_ZeroedEx + 53 && fs->win[i] == 0; i++) ;	/* Check zero filler */
        if (i < BPB_ZeroedEx + 53) return FR_NO_FILESYSTEM;
        
        if (ld_word(fs->win + BPB_FSVerEx) != 0x100) return FR_NO_FILESYSTEM;	/* Check exFAT version (must be version 1.0) */
        
        if (1 << fs->win[BPB_BytsPerSecEx] != SS(fs)) {	/* (BPB_BytsPerSecEx must be equal to the physical sector size) */
          return FR_NO_FILESYSTEM;
        }
        
        maxlba = ld_qword(fs->win + BPB_TotSecEx) + bsect;	/* Last LBA + 1 of the volume */
        if (maxlba >= 0x100000000) return FR_NO_FILESYSTEM;	/* (It cannot be handled in 32-bit LBA) */
        
        fs->fsize = ld_dword(fs->win + BPB_FatSzEx);	/* Number of sectors per FAT */
        
        fs->n_fats = fs->win[BPB_NumFATsEx];			/* Number of FATs */
        if (fs->n_fats != 1) return FR_NO_FILESYSTEM;	/* (Supports only 1 FAT) */
        
        fs->csize = 1 << fs->win[BPB_SecPerClusEx];		/* Cluster size */
        if (fs->csize == 0)	return FR_NO_FILESYSTEM;	/* (Must be 1..32768) */
        
        nclst = ld_dword(fs->win + BPB_NumClusEx);		/* Number of clusters */
        if (nclst > MAX_EXFAT) return FR_NO_FILESYSTEM;	/* (Too many clusters) */
        fs->n_fatent = nclst + 2;
        
        /* Boundaries and Limits */
        fs->volbase = bsect;
        fs->database = bsect + ld_dword(fs->win + BPB_DataOfsEx);
        fs->fatbase = bsect + ld_dword(fs->win + BPB_FatOfsEx);
        if (maxlba < (QWORD)fs->database + nclst * fs->csize) return FR_NO_FILESYSTEM;	/* (Volume size must not be smaller than the size requiered) */
        fs->dirbase = ld_dword(fs->win + BPB_RootClusEx);
        
        /* Check if bitmap location is in assumption (at the first cluster) */
        if (move_window(fs, clst2sect(fs, fs->dirbase)) != FR_OK) return FR_DISK_ERR;
        for (i = 0; i < SS(fs); i += SZDIRE) {
          if (fs->win[i] == 0x81 && ld_dword(fs->win + i + 20) == 2) break;	/* 81 entry with cluster #2? */
        }
        if (i == SS(fs)) return FR_NO_FILESYSTEM;
#if !FF_FS_READONLY
        fs->last_clst = fs->free_clst = 0xFFFFFFFF;		/* Initialize cluster allocation information */
#endif
        fmt = FS_EXFAT;			/* FAT sub-type */
      } else
#endif	/* FF_FS_EXFAT */
      {
        if (ld_word(fs->win + BPB_BytsPerSec) != SS(fs)) return FR_NO_FILESYSTEM;	/* (BPB_BytsPerSec must be equal to the physical sector size) */
        
        fasize = ld_word(fs->win + BPB_FATSz16);		/* Number of sectors per FAT */
        if (fasize == 0) fasize = ld_dword(fs->win + BPB_FATSz32);
        fs->fsize = fasize;
        
        fs->n_fats = fs->win[BPB_NumFATs];				/* Number of FATs */
        if (fs->n_fats != 1 && fs->n_fats != 2) return FR_NO_FILESYSTEM;	/* (Must be 1 or 2) */
        fasize *= fs->n_fats;							/* Number of sectors for FAT area */
        
        fs->csize = fs->win[BPB_SecPerClus];			/* Cluster size */
        if (fs->csize == 0 || (fs->csize & (fs->csize - 1))) return FR_NO_FILESYSTEM;	/* (Must be power of 2) */
        
        fs->n_rootdir = ld_word(fs->win + BPB_RootEntCnt);	/* Number of root directory entries */
        if (fs->n_rootdir % (SS(fs) / SZDIRE)) return FR_NO_FILESYSTEM;	/* (Must be sector aligned) */
        
        tsect = ld_word(fs->win + BPB_TotSec16);		/* Number of sectors on the volume */
        if (tsect == 0) tsect = ld_dword(fs->win + BPB_TotSec32);
        
        nrsv = ld_word(fs->win + BPB_RsvdSecCnt);		/* Number of reserved sectors */
        if (nrsv == 0) return FR_NO_FILESYSTEM;			/* (Must not be 0) */
        
        /* Determine the FAT sub type */
        sysect = nrsv + fasize + fs->n_rootdir / (SS(fs) / SZDIRE);	/* RSV + FAT + DIR */
        if (tsect < sysect) return FR_NO_FILESYSTEM;	/* (Invalid volume size) */
        nclst = (tsect - sysect) / fs->csize;			/* Number of clusters */
        if (nclst == 0) return FR_NO_FILESYSTEM;		/* (Invalid volume size) */
        fmt = 0;
        if (nclst <= MAX_FAT32) fmt = FS_FAT32;
        if (nclst <= MAX_FAT16) fmt = FS_FAT16;
        if (nclst <= MAX_FAT12) fmt = FS_FAT12;
        if (fmt == 0) return FR_NO_FILESYSTEM;
        
        /* Boundaries and Limits */
        fs->n_fatent = nclst + 2;						/* Number of FAT entries */
        fs->volbase = bsect;							/* Volume start sector */
        fs->fatbase = bsect + nrsv; 					/* FAT start sector */
        fs->database = bsect + sysect;					/* Data start sector */
        if (fmt == FS_FAT32) {
          if (ld_word(fs->win + BPB_FSVer32) != 0) return FR_NO_FILESYSTEM;	/* (Must be FAT32 revision 0.0) */
          if (fs->n_rootdir != 0) return FR_NO_FILESYSTEM;	/* (BPB_RootEntCnt must be 0) */
          fs->dirbase = ld_dword(fs->win + BPB_RootClus32);	/* Root directory start cluster */
          szbfat = fs->n_fatent * 4;					/* (Needed FAT size) */
        } else {
          if (fs->n_rootdir == 0)	return FR_NO_FILESYSTEM;	/* (BPB_RootEntCnt must not be 0) */
          fs->dirbase = fs->fatbase + fasize;			/* Root directory start sector */
          szbfat = (fmt == FS_FAT16) ?				/* (Needed FAT size) */
            fs->n_fatent * 2 : fs->n_fatent * 3 / 2 + (fs->n_fatent & 1);
        }
        if (fs->fsize < (szbfat + (SS(fs) - 1)) / SS(fs)) return FR_NO_FILESYSTEM;	/* (BPB_FATSz must not be less than the size needed) */
        
#if !FF_FS_READONLY
        /* Get FSInfo if available */
        fs->last_clst = fs->free_clst = 0xFFFFFFFF;		/* Initialize cluster allocation information */
        fs->fsi_flag = 0x80;
#if (FF_FS_NOFSINFO & 3) != 3
        if (fmt == FS_FAT32				/* Allow to update FSInfo only if BPB_FSInfo32 == 1 */
            && ld_word(fs->win + BPB_FSInfo32) == 1
              && move_window(fs, bsect + 1) == FR_OK)
        {
          fs->fsi_flag = 0;
          if (ld_word(fs->win + BS_55AA) == 0xAA55	/* Load FSInfo data if available */
              && ld_dword(fs->win + FSI_LeadSig) == 0x41615252
                && ld_dword(fs->win + FSI_StrucSig) == 0x61417272)
          {
#if (FF_FS_NOFSINFO & 1) == 0
            fs->free_clst = ld_dword(fs->win + FSI_Free_Count);
#endif
#if (FF_FS_NOFSINFO & 2) == 0
            fs->last_clst = ld_dword(fs->win + FSI_Nxt_Free);
#endif
          }
        }
#endif	/* (FF_FS_NOFSINFO & 3) != 3 */
#endif	/* !FF_FS_READONLY */
      }
      
      fs->fs_type = fmt;		/* FAT sub-type */
      fs->id = ++Fsid;		/* Volume mount ID */
#if FF_USE_LFN == 1
      fs->lfnbuf = LfnBuf;	/* Static LFN working buffer */
#if FF_FS_EXFAT
      fs->dirbuf = DirBuf;	/* Static directory block scratchpad buuffer */
#endif
#endif
#if FF_FS_RPATH != 0
      fs->cdir = 0;			/* Initialize current directory */
#endif
#if FF_FS_LOCK != 0			/* Clear file lock semaphores */
      clear_lock(fs);
#endif
      return FR_OK;
    }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Check if the file/directory object is valid or not                    */
  /*-----------------------------------------------------------------------*/
  
  static
    FRESULT validate (	/* Returns FR_OK or FR_INVALID_OBJECT */
                      FFOBJID* obj,	/* Pointer to the FFOBJID, the 1st member in the FIL/DIR object, to check validity */
                      FATFS** rfs		/* Pointer to pointer to the owner filesystem object to return */
                        )
    {
      FRESULT res = FR_INVALID_OBJECT;
      
      
      if (obj && obj->fs && obj->fs->fs_type && obj->id == obj->fs->id) {	/* Test if the object is valid */
#if FF_FS_REENTRANT
        if (lock_fs(obj->fs)) {	/* Obtain the filesystem object */
          if (!(disk_status(obj->fs->pdrv) & STA_NOINIT)) { /* Test if the phsical drive is kept initialized */
            res = FR_OK;
          } else {
            unlock_fs(obj->fs, FR_OK);
          }
        } else {
          res = FR_TIMEOUT;
        }
#else
        if (!(disk_status(obj->fs->pdrv) & STA_NOINIT)) { /* Test if the phsical drive is kept initialized */
          res = FR_OK;
        }
#endif
      }
      *rfs = (res == FR_OK) ? obj->fs : 0;	/* Corresponding filesystem object */
      return res;
    }
  
  
  
  
  /*---------------------------------------------------------------------------
  
  Public Functions (FatFs API)
  
  ----------------------------------------------------------------------------*/
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Mount/Unmount a Logical Drive                                         */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_mount (
                   FATFS* fs,			/* Pointer to the filesystem object (NULL:unmount)*/
                   const TCHAR* path,	/* Logical drive number to be mounted/unmounted */
                   BYTE opt			/* Mode option 0:Do not mount (delayed mount), 1:Mount immediately */
                     )
  {
    FATFS *cfs;
    int vol;
    FRESULT res;
    const TCHAR *rp = path;
    
    
    /* Get logical drive number */
    vol = get_ldnumber(&rp);
    if (vol < 0) return FR_INVALID_DRIVE;
    cfs = FatFs[vol];					/* Pointer to fs object */
    
    if (cfs) {
#if FF_FS_LOCK != 0
      clear_lock(cfs);
#endif
#if FF_FS_REENTRANT						/* Discard sync object of the current volume */
      if (!ff_del_syncobj(cfs->sobj)) return FR_INT_ERR;
#endif
      cfs->fs_type = 0;				/* Clear old fs object */
    }
    
    if (fs) {
      fs->fs_type = 0;				/* Clear new fs object */
#if FF_FS_REENTRANT						/* Create sync object for the new volume */
      if (!ff_cre_syncobj((BYTE)vol, &fs->sobj)) return FR_INT_ERR;
#endif
    }
    FatFs[vol] = fs;					/* Register new fs object */
    
    if (opt == 0) return FR_OK;			/* Do not mount now, it will be mounted later */
    
    res = find_volume(&path, &fs, 0);	/* Force mounted the volume */
    LEAVE_FF(fs, res);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Open or Create a File                                                 */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_open (
                  FIL* fp,			/* Pointer to the blank file object */
                  const TCHAR* path,	/* Pointer to the file name */
                  BYTE mode			/* Access mode and file open mode flags */
                    )
  {
    FRESULT res;
    DIR dj;
    FATFS *fs;
#if !FF_FS_READONLY
    DWORD dw, cl, bcs, clst, sc;
    FSIZE_t ofs;
#endif
    DEF_NAMBUF
      
      
      if (!fp) return FR_INVALID_OBJECT;
    
    /* Get logical drive */
    mode &= FF_FS_READONLY ? FA_READ : FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_CREATE_NEW | FA_OPEN_ALWAYS | FA_OPEN_APPEND;
    res = find_volume(&path, &fs, mode);
    if (res == FR_OK) {
      dj.obj.fs = fs;
      INIT_NAMBUF(fs);
      res = follow_path(&dj, path);	/* Follow the file path */
#if !FF_FS_READONLY	/* Read/Write configuration */
      if (res == FR_OK) {
        if (dj.fn[NSFLAG] & NS_NONAME) {	/* Origin directory itself? */
          res = FR_INVALID_NAME;
        }
#if FF_FS_LOCK != 0
        else {
          res = chk_lock(&dj, (mode & ~FA_READ) ? 1 : 0);		/* Check if the file can be used */
        }
#endif
      }
      /* Create or Open a file */
      if (mode & (FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW)) {
        if (res != FR_OK) {					/* No file, create new */
          if (res == FR_NO_FILE) {		/* There is no file to open, create a new entry */
#if FF_FS_LOCK != 0
            res = enq_lock() ? dir_register(&dj) : FR_TOO_MANY_OPEN_FILES;
#else
            res = dir_register(&dj);
#endif
          }
          mode |= FA_CREATE_ALWAYS;		/* File is created */
        }
        else {								/* Any object with the same name is already existing */
          if (dj.obj.attr & (AM_RDO | AM_DIR)) {	/* Cannot overwrite it (R/O or DIR) */
            res = FR_DENIED;
          } else {
            if (mode & FA_CREATE_NEW) res = FR_EXIST;	/* Cannot create as new file */
          }
        }
        if (res == FR_OK && (mode & FA_CREATE_ALWAYS)) {	/* Truncate the file if overwrite mode */
#if FF_FS_EXFAT
          if (fs->fs_type == FS_EXFAT) {
            /* Get current allocation info */
            fp->obj.fs = fs;
            init_alloc_info(fs, &fp->obj);
            /* Set directory entry block initial state */
            mem_set(fs->dirbuf + 2, 0, 30);		/* Clear 85 entry except for NumSec */
            mem_set(fs->dirbuf + 38, 0, 26);	/* Clear C0 entry except for NumName and NameHash */
            fs->dirbuf[XDIR_Attr] = AM_ARC;
            st_dword(fs->dirbuf + XDIR_CrtTime, GET_FATTIME());
            fs->dirbuf[XDIR_GenFlags] = 1;
            res = store_xdir(&dj);
            if (res == FR_OK && fp->obj.sclust != 0) {	/* Remove the cluster chain if exist */
              res = remove_chain(&fp->obj, fp->obj.sclust, 0);
              fs->last_clst = fp->obj.sclust - 1;		/* Reuse the cluster hole */
            }
          } else
#endif
          {
            /* Set directory entry initial state */
            cl = ld_clust(fs, dj.dir);			/* Get current cluster chain */
            st_dword(dj.dir + DIR_CrtTime, GET_FATTIME());	/* Set created time */
            dj.dir[DIR_Attr] = AM_ARC;			/* Reset attribute */
            st_clust(fs, dj.dir, 0);			/* Reset file allocation info */
            st_dword(dj.dir + DIR_FileSize, 0);
            fs->wflag = 1;
            if (cl != 0) {						/* Remove the cluster chain if exist */
              dw = fs->winsect;
              res = remove_chain(&dj.obj, cl, 0);
              if (res == FR_OK) {
                res = move_window(fs, dw);
                fs->last_clst = cl - 1;		/* Reuse the cluster hole */
              }
            }
          }
        }
      }
      else {	/* Open an existing file */
        if (res == FR_OK) {					/* Is the object exsiting? */
          if (dj.obj.attr & AM_DIR) {		/* File open against a directory */
            res = FR_NO_FILE;
          } else {
            if ((mode & FA_WRITE) && (dj.obj.attr & AM_RDO)) { /* Write mode open against R/O file */
              res = FR_DENIED;
            }
          }
        }
      }
      if (res == FR_OK) {
        if (mode & FA_CREATE_ALWAYS) mode |= FA_MODIFIED;	/* Set file change flag if created or overwritten */
        fp->dir_sect = fs->winsect;			/* Pointer to the directory entry */
        fp->dir_ptr = dj.dir;
#if FF_FS_LOCK != 0
        fp->obj.lockid = inc_lock(&dj, (mode & ~FA_READ) ? 1 : 0);	/* Lock the file for this session */
        if (fp->obj.lockid == 0) res = FR_INT_ERR;
#endif
      }
#else		/* R/O configuration */
      if (res == FR_OK) {
        if (dj.fn[NSFLAG] & NS_NONAME) {	/* Is it origin directory itself? */
          res = FR_INVALID_NAME;
        } else {
          if (dj.obj.attr & AM_DIR) {		/* Is it a directory? */
            res = FR_NO_FILE;
          }
        }
      }
#endif
      
      if (res == FR_OK) {
#if FF_FS_EXFAT
        if (fs->fs_type == FS_EXFAT) {
          fp->obj.c_scl = dj.obj.sclust;							/* Get containing directory info */
          fp->obj.c_size = ((DWORD)dj.obj.objsize & 0xFFFFFF00) | dj.obj.stat;
          fp->obj.c_ofs = dj.blk_ofs;
          init_alloc_info(fs, &fp->obj);
        } else
#endif
        {
          fp->obj.sclust = ld_clust(fs, dj.dir);					/* Get object allocation info */
          fp->obj.objsize = ld_dword(dj.dir + DIR_FileSize);
        }
#if FF_USE_FASTSEEK
        fp->cltbl = 0;			/* Disable fast seek mode */
#endif
        fp->obj.fs = fs;	 	/* Validate the file object */
        fp->obj.id = fs->id;
        fp->flag = mode;		/* Set file access mode */
        fp->err = 0;			/* Clear error flag */
        fp->sect = 0;			/* Invalidate current data sector */
        fp->fptr = 0;			/* Set file pointer top of the file */
#if !FF_FS_READONLY
#if !FF_FS_TINY
        mem_set(fp->buf, 0, FF_MAX_SS);	/* Clear sector buffer */
#endif
        if ((mode & FA_SEEKEND) && fp->obj.objsize > 0) {	/* Seek to end of file if FA_OPEN_APPEND is specified */
          fp->fptr = fp->obj.objsize;			/* Offset to seek */
          bcs = (DWORD)fs->csize * SS(fs);	/* Cluster size in byte */
          clst = fp->obj.sclust;				/* Follow the cluster chain */
          for (ofs = fp->obj.objsize; res == FR_OK && ofs > bcs; ofs -= bcs) {
            clst = get_fat(&fp->obj, clst);
            if (clst <= 1) res = FR_INT_ERR;
            if (clst == 0xFFFFFFFF) res = FR_DISK_ERR;
          }
          fp->clust = clst;
          if (res == FR_OK && ofs % SS(fs)) {	/* Fill sector buffer if not on the sector boundary */
            if ((sc = clst2sect(fs, clst)) == 0) {
              res = FR_INT_ERR;
            } else {
              fp->sect = sc + (DWORD)(ofs / SS(fs));
#if !FF_FS_TINY
              if (disk_read(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) res = FR_DISK_ERR;
#endif
            }
          }
        }
#endif
      }
      
      FREE_NAMBUF();
    }
    
    if (res != FR_OK) fp->obj.fs = 0;	/* Invalidate file object on error */
    
    LEAVE_FF(fs, res);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Read File                                                             */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_read (
                  FIL* fp, 	/* Pointer to the file object */
                  void* buff,	/* Pointer to data buffer */
                  UINT btr,	/* Number of bytes to read */
                  UINT* br	/* Pointer to number of bytes read */
                    )
  {
    FRESULT res;
    FATFS *fs;
    DWORD clst, sect;
    FSIZE_t remain;
    UINT rcnt, cc, csect;
    BYTE *rbuff = (BYTE*)buff;
    
    
    *br = 0;	/* Clear read byte counter */
    res = validate(&fp->obj, &fs);				/* Check validity of the file object */
    if (res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) LEAVE_FF(fs, res);	/* Check validity */
    if (!(fp->flag & FA_READ)) LEAVE_FF(fs, FR_DENIED); /* Check access mode */
    remain = fp->obj.objsize - fp->fptr;
    if (btr > remain) btr = (UINT)remain;		/* Truncate btr by remaining bytes */
    
    for ( ;  btr;								/* Repeat until all data read */
    btr -= rcnt, *br += rcnt, rbuff += rcnt, fp->fptr += rcnt) {
      if (fp->fptr % SS(fs) == 0) {			/* On the sector boundary? */
        csect = (UINT)(fp->fptr / SS(fs) & (fs->csize - 1));	/* Sector offset in the cluster */
        if (csect == 0) {					/* On the cluster boundary? */
          if (fp->fptr == 0) {			/* On the top of the file? */
            clst = fp->obj.sclust;		/* Follow cluster chain from the origin */
          } else {						/* Middle or end of the file */
#if FF_USE_FASTSEEK
            if (fp->cltbl) {
              clst = clmt_clust(fp, fp->fptr);	/* Get cluster# from the CLMT */
            } else
#endif
            {
              clst = get_fat(&fp->obj, fp->clust);	/* Follow cluster chain on the FAT */
            }
          }
          if (clst < 2) ABORT(fs, FR_INT_ERR);
          if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
          fp->clust = clst;				/* Update current cluster */
        }
        sect = clst2sect(fs, fp->clust);	/* Get current sector */
        if (sect == 0) ABORT(fs, FR_INT_ERR);
        sect += csect;
        cc = btr / SS(fs);					/* When remaining bytes >= sector size, */
        if (cc > 0) {						/* Read maximum contiguous sectors directly */
          if (csect + cc > fs->csize) {	/* Clip at cluster boundary */
            cc = fs->csize - csect;
          }
          if (disk_read(fs->pdrv, rbuff, sect, cc) != RES_OK) ABORT(fs, FR_DISK_ERR);
#if !FF_FS_READONLY && FF_FS_MINIMIZE <= 2		/* Replace one of the read sectors with cached data if it contains a dirty sector */
#if FF_FS_TINY
          if (fs->wflag && fs->winsect - sect < cc) {
            mem_cpy(rbuff + ((fs->winsect - sect) * SS(fs)), fs->win, SS(fs));
          }
#else
          if ((fp->flag & FA_DIRTY) && fp->sect - sect < cc) {
            mem_cpy(rbuff + ((fp->sect - sect) * SS(fs)), fp->buf, SS(fs));
          }
#endif
#endif
          rcnt = SS(fs) * cc;				/* Number of bytes transferred */
          continue;
        }
#if !FF_FS_TINY
        if (fp->sect != sect) {			/* Load data sector if not in cache */
#if !FF_FS_READONLY
          if (fp->flag & FA_DIRTY) {		/* Write-back dirty sector cache */
            if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
            fp->flag &= (BYTE)~FA_DIRTY;
          }
#endif
          if (disk_read(fs->pdrv, fp->buf, sect, 1) != RES_OK)	ABORT(fs, FR_DISK_ERR);	/* Fill sector cache */
        }
#endif
        fp->sect = sect;
      }
      rcnt = SS(fs) - (UINT)fp->fptr % SS(fs);	/* Number of bytes left in the sector */
      if (rcnt > btr) rcnt = btr;					/* Clip it by btr if needed */
#if FF_FS_TINY
      if (move_window(fs, fp->sect) != FR_OK) ABORT(fs, FR_DISK_ERR);	/* Move sector window */
      mem_cpy(rbuff, fs->win + fp->fptr % SS(fs), rcnt);	/* Extract partial sector */
#else
      mem_cpy(rbuff, fp->buf + fp->fptr % SS(fs), rcnt);	/* Extract partial sector */
#endif
    }
    
    LEAVE_FF(fs, FR_OK);
  }
  
  
  
  
#if !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* Write File                                                            */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_write (
                   FIL* fp,			/* Pointer to the file object */
                   const void* buff,	/* Pointer to the data to be written */
                   UINT btw,			/* Number of bytes to write */
                   UINT* bw			/* Pointer to number of bytes written */
                     )
  {
    FRESULT res;
    FATFS *fs;
    DWORD clst, sect;
    UINT wcnt, cc, csect;
    const BYTE *wbuff = (const BYTE*)buff;
    
    
    *bw = 0;	/* Clear write byte counter */
    res = validate(&fp->obj, &fs);			/* Check validity of the file object */
    if (res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) LEAVE_FF(fs, res);	/* Check validity */
    if (!(fp->flag & FA_WRITE)) LEAVE_FF(fs, FR_DENIED);	/* Check access mode */
    
    /* Check fptr wrap-around (file size cannot reach 4 GiB at FAT volume) */
    if ((!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) && (DWORD)(fp->fptr + btw) < (DWORD)fp->fptr) {
      btw = (UINT)(0xFFFFFFFF - (DWORD)fp->fptr);
    }
    
    for ( ;  btw;							/* Repeat until all data written */
    btw -= wcnt, *bw += wcnt, wbuff += wcnt, fp->fptr += wcnt, fp->obj.objsize = (fp->fptr > fp->obj.objsize) ? fp->fptr : fp->obj.objsize) {
      if (fp->fptr % SS(fs) == 0) {		/* On the sector boundary? */
        csect = (UINT)(fp->fptr / SS(fs)) & (fs->csize - 1);	/* Sector offset in the cluster */
        if (csect == 0) {				/* On the cluster boundary? */
          if (fp->fptr == 0) {		/* On the top of the file? */
            clst = fp->obj.sclust;	/* Follow from the origin */
            if (clst == 0) {		/* If no cluster is allocated, */
              clst = create_chain(&fp->obj, 0);	/* create a new cluster chain */
            }
          } else {					/* On the middle or end of the file */
#if FF_USE_FASTSEEK
            if (fp->cltbl) {
              clst = clmt_clust(fp, fp->fptr);	/* Get cluster# from the CLMT */
            } else
#endif
            {
              clst = create_chain(&fp->obj, fp->clust);	/* Follow or stretch cluster chain on the FAT */
            }
          }
          if (clst == 0) break;		/* Could not allocate a new cluster (disk full) */
          if (clst == 1) ABORT(fs, FR_INT_ERR);
          if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
          fp->clust = clst;			/* Update current cluster */
          if (fp->obj.sclust == 0) fp->obj.sclust = clst;	/* Set start cluster if the first write */
        }
#if FF_FS_TINY
        if (fs->winsect == fp->sect && sync_window(fs) != FR_OK) ABORT(fs, FR_DISK_ERR);	/* Write-back sector cache */
#else
        if (fp->flag & FA_DIRTY) {		/* Write-back sector cache */
          if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
          fp->flag &= (BYTE)~FA_DIRTY;
        }
#endif
        sect = clst2sect(fs, fp->clust);	/* Get current sector */
        if (sect == 0) ABORT(fs, FR_INT_ERR);
        sect += csect;
        cc = btw / SS(fs);				/* When remaining bytes >= sector size, */
        if (cc > 0) {					/* Write maximum contiguous sectors directly */
          if (csect + cc > fs->csize) {	/* Clip at cluster boundary */
            cc = fs->csize - csect;
          }
          if (disk_write(fs->pdrv, wbuff, sect, cc) != RES_OK) ABORT(fs, FR_DISK_ERR);
#if FF_FS_MINIMIZE <= 2
#if FF_FS_TINY
          if (fs->winsect - sect < cc) {	/* Refill sector cache if it gets invalidated by the direct write */
            mem_cpy(fs->win, wbuff + ((fs->winsect - sect) * SS(fs)), SS(fs));
            fs->wflag = 0;
          }
#else
          if (fp->sect - sect < cc) { /* Refill sector cache if it gets invalidated by the direct write */
            mem_cpy(fp->buf, wbuff + ((fp->sect - sect) * SS(fs)), SS(fs));
            fp->flag &= (BYTE)~FA_DIRTY;
          }
#endif
#endif
          wcnt = SS(fs) * cc;		/* Number of bytes transferred */
          continue;
        }
#if FF_FS_TINY
        if (fp->fptr >= fp->obj.objsize) {	/* Avoid silly cache filling on the growing edge */
          if (sync_window(fs) != FR_OK) ABORT(fs, FR_DISK_ERR);
          fs->winsect = sect;
        }
#else
        if (fp->sect != sect && 		/* Fill sector cache with file data */
            fp->fptr < fp->obj.objsize &&
              disk_read(fs->pdrv, fp->buf, sect, 1) != RES_OK) {
                ABORT(fs, FR_DISK_ERR);
              }
#endif
        fp->sect = sect;
      }
      wcnt = SS(fs) - (UINT)fp->fptr % SS(fs);	/* Number of bytes left in the sector */
      if (wcnt > btw) wcnt = btw;					/* Clip it by btw if needed */
#if FF_FS_TINY
      if (move_window(fs, fp->sect) != FR_OK) ABORT(fs, FR_DISK_ERR);	/* Move sector window */
      mem_cpy(fs->win + fp->fptr % SS(fs), wbuff, wcnt);	/* Fit data to the sector */
      fs->wflag = 1;
#else
      mem_cpy(fp->buf + fp->fptr % SS(fs), wbuff, wcnt);	/* Fit data to the sector */
      fp->flag |= FA_DIRTY;
#endif
    }
    
    fp->flag |= FA_MODIFIED;				/* Set file change flag */
    
    LEAVE_FF(fs, FR_OK);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Synchronize the File                                                  */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_sync (
                  FIL* fp		/* Pointer to the file object */
                    )
  {
    FRESULT res;
    FATFS *fs;
    DWORD tm;
    BYTE *dir;
    
    
    res = validate(&fp->obj, &fs);	/* Check validity of the file object */
    if (res == FR_OK) {
      if (fp->flag & FA_MODIFIED) {	/* Is there any change to the file? */
#if !FF_FS_TINY
        if (fp->flag & FA_DIRTY) {	/* Write-back cached data if needed */
          if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) LEAVE_FF(fs, FR_DISK_ERR);
          fp->flag &= (BYTE)~FA_DIRTY;
        }
#endif
        /* Update the directory entry */
        tm = GET_FATTIME();				/* Modified time */
#if FF_FS_EXFAT
        if (fs->fs_type == FS_EXFAT) {
          res = fill_first_frag(&fp->obj);	/* Fill first fragment on the FAT if needed */
          if (res == FR_OK) {
            res = fill_last_frag(&fp->obj, fp->clust, 0xFFFFFFFF);	/* Fill last fragment on the FAT if needed */
          }
          if (res == FR_OK) {
            DIR dj;
            DEF_NAMBUF
              
              INIT_NAMBUF(fs);
            res = load_obj_xdir(&dj, &fp->obj);	/* Load directory entry block */
            if (res == FR_OK) {
              fs->dirbuf[XDIR_Attr] |= AM_ARC;				/* Set archive attribute to indicate that the file has been changed */
              fs->dirbuf[XDIR_GenFlags] = fp->obj.stat | 1;	/* Update file allocation information */
              st_dword(fs->dirbuf + XDIR_FstClus, fp->obj.sclust);
              st_qword(fs->dirbuf + XDIR_FileSize, fp->obj.objsize);
              st_qword(fs->dirbuf + XDIR_ValidFileSize, fp->obj.objsize);
              st_dword(fs->dirbuf + XDIR_ModTime, tm);		/* Update modified time */
              fs->dirbuf[XDIR_ModTime10] = 0;
              st_dword(fs->dirbuf + XDIR_AccTime, 0);
              res = store_xdir(&dj);	/* Restore it to the directory */
              if (res == FR_OK) {
                res = sync_fs(fs);
                fp->flag &= (BYTE)~FA_MODIFIED;
              }
            }
            FREE_NAMBUF();
          }
        } else
#endif
        {
          res = move_window(fs, fp->dir_sect);
          if (res == FR_OK) {
            dir = fp->dir_ptr;
            dir[DIR_Attr] |= AM_ARC;						/* Set archive attribute to indicate that the file has been changed */
            st_clust(fp->obj.fs, dir, fp->obj.sclust);		/* Update file allocation information  */
            st_dword(dir + DIR_FileSize, (DWORD)fp->obj.objsize);	/* Update file size */
            st_dword(dir + DIR_ModTime, tm);				/* Update modified time */
            st_word(dir + DIR_LstAccDate, 0);
            fs->wflag = 1;
            res = sync_fs(fs);					/* Restore it to the directory */
            fp->flag &= (BYTE)~FA_MODIFIED;
          }
        }
      }
    }
    
    LEAVE_FF(fs, res);
  }
  
#endif /* !FF_FS_READONLY */
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Close File                                                            */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_close (
                   FIL* fp		/* Pointer to the file object to be closed */
                     )
  {
    FRESULT res;
    FATFS *fs;
    
#if !FF_FS_READONLY
    res = f_sync(fp);					/* Flush cached data */
    if (res == FR_OK)
#endif
    {
      res = validate(&fp->obj, &fs);	/* Lock volume */
      if (res == FR_OK) {
#if FF_FS_LOCK != 0
        res = dec_lock(fp->obj.lockid);		/* Decrement file open counter */
        if (res == FR_OK) fp->obj.fs = 0;	/* Invalidate file object */
#else
        fp->obj.fs = 0;	/* Invalidate file object */
#endif
#if FF_FS_REENTRANT
        unlock_fs(fs, FR_OK);		/* Unlock volume */
#endif
      }
    }
    return res;
  }
  
  
  
  
#if FF_FS_RPATH >= 1
  /*-----------------------------------------------------------------------*/
  /* Change Current Directory or Current Drive, Get Current Directory      */
  /*-----------------------------------------------------------------------*/
  
#if FF_VOLUMES >= 2
  FRESULT f_chdrive (
                     const TCHAR* path		/* Drive number */
                       )
  {
    int vol;
    
    
    /* Get logical drive number */
    vol = get_ldnumber(&path);
    if (vol < 0) return FR_INVALID_DRIVE;
    
    CurrVol = (BYTE)vol;	/* Set it as current volume */
    
    return FR_OK;
  }
#endif
  
  
  FRESULT f_chdir (
                   const TCHAR* path	/* Pointer to the directory path */
                     )
  {
    FRESULT res;
    DIR dj;
    FATFS *fs;
    DEF_NAMBUF
      
      /* Get logical drive */
      res = find_volume(&path, &fs, 0);
    if (res == FR_OK) {
      dj.obj.fs = fs;
      INIT_NAMBUF(fs);
      res = follow_path(&dj, path);		/* Follow the path */
      if (res == FR_OK) {					/* Follow completed */
        if (dj.fn[NSFLAG] & NS_NONAME) {
          fs->cdir = dj.obj.sclust;	/* It is the start directory itself */
#if FF_FS_EXFAT
          if (fs->fs_type == FS_EXFAT) {
            fs->cdc_scl = dj.obj.c_scl;
            fs->cdc_size = dj.obj.c_size;
            fs->cdc_ofs = dj.obj.c_ofs;
          }
#endif
        } else {
          if (dj.obj.attr & AM_DIR) {	/* It is a sub-directory */
#if FF_FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {
              fs->cdir = ld_dword(fs->dirbuf + XDIR_FstClus);		/* Sub-directory cluster */
              fs->cdc_scl = dj.obj.sclust;						/* Save containing directory information */
              fs->cdc_size = ((DWORD)dj.obj.objsize & 0xFFFFFF00) | dj.obj.stat;
              fs->cdc_ofs = dj.blk_ofs;
            } else
#endif
            {
              fs->cdir = ld_clust(fs, dj.dir);					/* Sub-directory cluster */
            }
          } else {
            res = FR_NO_PATH;		/* Reached but a file */
          }
        }
      }
      FREE_NAMBUF();
      if (res == FR_NO_FILE) res = FR_NO_PATH;
    }
    
    LEAVE_FF(fs, res);
  }
  
  
#if FF_FS_RPATH >= 2
  FRESULT f_getcwd (
                    TCHAR* buff,	/* Pointer to the directory path */
                    UINT len		/* Size of path */
                      )
  {
    FRESULT res;
    DIR dj;
    FATFS *fs;
    UINT i, n;
    DWORD ccl;
    TCHAR *tp;
    FILINFO fno;
    DEF_NAMBUF
      
      
      *buff = 0;
    /* Get logical drive */
    res = find_volume((const TCHAR**)&buff, &fs, 0);	/* Get current volume */
    if (res == FR_OK) {
      dj.obj.fs = fs;
      INIT_NAMBUF(fs);
      i = len;			/* Bottom of buffer (directory stack base) */
      if (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) {	/* (Cannot do getcwd on exFAT and returns root path) */
        dj.obj.sclust = fs->cdir;				/* Start to follow upper directory from current directory */
        while ((ccl = dj.obj.sclust) != 0) {	/* Repeat while current directory is a sub-directory */
          res = dir_sdi(&dj, 1 * SZDIRE);	/* Get parent directory */
          if (res != FR_OK) break;
          res = move_window(fs, dj.sect);
          if (res != FR_OK) break;
          dj.obj.sclust = ld_clust(fs, dj.dir);	/* Goto parent directory */
          res = dir_sdi(&dj, 0);
          if (res != FR_OK) break;
          do {							/* Find the entry links to the child directory */
            res = dir_read_file(&dj);
            if (res != FR_OK) break;
            if (ccl == ld_clust(fs, dj.dir)) break;	/* Found the entry */
            res = dir_next(&dj, 0);
          } while (res == FR_OK);
          if (res == FR_NO_FILE) res = FR_INT_ERR;/* It cannot be 'not found'. */
          if (res != FR_OK) break;
          get_fileinfo(&dj, &fno);		/* Get the directory name and push it to the buffer */
          for (n = 0; fno.fname[n]; n++) ;
          if (i < n + 3) {
            res = FR_NOT_ENOUGH_CORE; break;
          }
          while (n) buff[--i] = fno.fname[--n];
          buff[--i] = '/';
        }
      }
      tp = buff;
      if (res == FR_OK) {
#if FF_VOLUMES >= 2
        *tp++ = '0' + CurrVol;			/* Put drive number */
        *tp++ = ':';
#endif
        if (i == len) {					/* Root-directory */
          *tp++ = '/';
        } else {						/* Sub-directroy */
          do		/* Add stacked path str */
            *tp++ = buff[i++];
          while (i < len);
        }
      }
      *tp = 0;
      FREE_NAMBUF();
    }
    
    LEAVE_FF(fs, res);
  }
  
#endif /* FF_FS_RPATH >= 2 */
#endif /* FF_FS_RPATH >= 1 */
  
  
  
#if FF_FS_MINIMIZE <= 2
  /*-----------------------------------------------------------------------*/
  /* Seek File Read/Write Pointer                                          */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_lseek (
                   FIL* fp,		/* Pointer to the file object */
                   FSIZE_t ofs		/* File pointer from top of file */
                     )
  {
    FRESULT res;
    FATFS *fs;
    DWORD clst, bcs, nsect;
    FSIZE_t ifptr;
#if FF_USE_FASTSEEK
    DWORD cl, pcl, ncl, tcl, dsc, tlen, ulen, *tbl;
#endif
    
    res = validate(&fp->obj, &fs);		/* Check validity of the file object */
    if (res == FR_OK) res = (FRESULT)fp->err;
#if FF_FS_EXFAT && !FF_FS_READONLY
    if (res == FR_OK && fs->fs_type == FS_EXFAT) {
      res = fill_last_frag(&fp->obj, fp->clust, 0xFFFFFFFF);	/* Fill last fragment on the FAT if needed */
    }
#endif
    if (res != FR_OK) LEAVE_FF(fs, res);
    
#if FF_USE_FASTSEEK
    if (fp->cltbl) {	/* Fast seek */
      if (ofs == CREATE_LINKMAP) {	/* Create CLMT */
        tbl = fp->cltbl;
        tlen = *tbl++; ulen = 2;	/* Given table size and required table size */
        cl = fp->obj.sclust;		/* Origin of the chain */
        if (cl != 0) {
          do {
            /* Get a fragment */
            tcl = cl; ncl = 0; ulen += 2;	/* Top, length and used items */
            do {
              pcl = cl; ncl++;
              cl = get_fat(&fp->obj, cl);
              if (cl <= 1) ABORT(fs, FR_INT_ERR);
              if (cl == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
            } while (cl == pcl + 1);
            if (ulen <= tlen) {		/* Store the length and top of the fragment */
              *tbl++ = ncl; *tbl++ = tcl;
            }
          } while (cl < fs->n_fatent);	/* Repeat until end of chain */
        }
        *fp->cltbl = ulen;	/* Number of items used */
        if (ulen <= tlen) {
          *tbl = 0;		/* Terminate table */
        } else {
          res = FR_NOT_ENOUGH_CORE;	/* Given table size is smaller than required */
        }
      } else {						/* Fast seek */
        if (ofs > fp->obj.objsize) ofs = fp->obj.objsize;	/* Clip offset at the file size */
        fp->fptr = ofs;				/* Set file pointer */
        if (ofs > 0) {
          fp->clust = clmt_clust(fp, ofs - 1);
          dsc = clst2sect(fs, fp->clust);
          if (dsc == 0) ABORT(fs, FR_INT_ERR);
          dsc += (DWORD)((ofs - 1) / SS(fs)) & (fs->csize - 1);
          if (fp->fptr % SS(fs) && dsc != fp->sect) {	/* Refill sector cache if needed */
#if !FF_FS_TINY
#if !FF_FS_READONLY
            if (fp->flag & FA_DIRTY) {		/* Write-back dirty sector cache */
              if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
              fp->flag &= (BYTE)~FA_DIRTY;
            }
#endif
            if (disk_read(fs->pdrv, fp->buf, dsc, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);	/* Load current sector */
#endif
            fp->sect = dsc;
          }
        }
      }
    } else
#endif
      
      /* Normal Seek */
    {
#if FF_FS_EXFAT
      if (fs->fs_type != FS_EXFAT && ofs >= 0x100000000) ofs = 0xFFFFFFFF;	/* Clip at 4 GiB - 1 if at FATxx */
#endif
      if (ofs > fp->obj.objsize && (FF_FS_READONLY || !(fp->flag & FA_WRITE))) {	/* In read-only mode, clip offset with the file size */
        ofs = fp->obj.objsize;
      }
      ifptr = fp->fptr;
      fp->fptr = nsect = 0;
      if (ofs > 0) {
        bcs = (DWORD)fs->csize * SS(fs);	/* Cluster size (byte) */
        if (ifptr > 0 &&
            (ofs - 1) / bcs >= (ifptr - 1) / bcs) {	/* When seek to same or following cluster, */
              fp->fptr = (ifptr - 1) & ~(FSIZE_t)(bcs - 1);	/* start from the current cluster */
              ofs -= fp->fptr;
              clst = fp->clust;
            } else {									/* When seek to back cluster, */
              clst = fp->obj.sclust;					/* start from the first cluster */
#if !FF_FS_READONLY
              if (clst == 0) {						/* If no cluster chain, create a new chain */
                clst = create_chain(&fp->obj, 0);
                if (clst == 1) ABORT(fs, FR_INT_ERR);
                if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
                fp->obj.sclust = clst;
              }
#endif
              fp->clust = clst;
            }
        if (clst != 0) {
          while (ofs > bcs) {						/* Cluster following loop */
            ofs -= bcs; fp->fptr += bcs;
#if !FF_FS_READONLY
            if (fp->flag & FA_WRITE) {			/* Check if in write mode or not */
              if (FF_FS_EXFAT && fp->fptr > fp->obj.objsize) {	/* No FAT chain object needs correct objsize to generate FAT value */
                fp->obj.objsize = fp->fptr;
                fp->flag |= FA_MODIFIED;
              }
              clst = create_chain(&fp->obj, clst);	/* Follow chain with forceed stretch */
              if (clst == 0) {				/* Clip file size in case of disk full */
                ofs = 0; break;
              }
            } else
#endif
            {
              clst = get_fat(&fp->obj, clst);	/* Follow cluster chain if not in write mode */
            }
            if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
            if (clst <= 1 || clst >= fs->n_fatent) ABORT(fs, FR_INT_ERR);
            fp->clust = clst;
          }
          fp->fptr += ofs;
          if (ofs % SS(fs)) {
            nsect = clst2sect(fs, clst);	/* Current sector */
            if (nsect == 0) ABORT(fs, FR_INT_ERR);
            nsect += (DWORD)(ofs / SS(fs));
          }
        }
      }
      if (!FF_FS_READONLY && fp->fptr > fp->obj.objsize) {	/* Set file change flag if the file size is extended */
        fp->obj.objsize = fp->fptr;
        fp->flag |= FA_MODIFIED;
      }
      if (fp->fptr % SS(fs) && nsect != fp->sect) {	/* Fill sector cache if needed */
#if !FF_FS_TINY
#if !FF_FS_READONLY
        if (fp->flag & FA_DIRTY) {			/* Write-back dirty sector cache */
          if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
          fp->flag &= (BYTE)~FA_DIRTY;
        }
#endif
        if (disk_read(fs->pdrv, fp->buf, nsect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);	/* Fill sector cache */
#endif
        fp->sect = nsect;
      }
    }
    
    LEAVE_FF(fs, res);
  }
  
  
  
#if FF_FS_MINIMIZE <= 1
  /*-----------------------------------------------------------------------*/
  /* Create a Directory Object                                             */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_opendir (
                     DIR* dp,			/* Pointer to directory object to create */
                     const TCHAR* path	/* Pointer to the directory path */
                       )
  {
    FRESULT res;
    FATFS *fs;
    DEF_NAMBUF
      
      
      if (!dp) return FR_INVALID_OBJECT;
    
    /* Get logical drive */
    res = find_volume(&path, &fs, 0);
    if (res == FR_OK) {
      dp->obj.fs = fs;
      INIT_NAMBUF(fs);
      res = follow_path(dp, path);			/* Follow the path to the directory */
      if (res == FR_OK) {						/* Follow completed */
        if (!(dp->fn[NSFLAG] & NS_NONAME)) {	/* It is not the origin directory itself */
          if (dp->obj.attr & AM_DIR) {		/* This object is a sub-directory */
#if FF_FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {
              dp->obj.c_scl = dp->obj.sclust;							/* Get containing directory inforamation */
              dp->obj.c_size = ((DWORD)dp->obj.objsize & 0xFFFFFF00) | dp->obj.stat;
              dp->obj.c_ofs = dp->blk_ofs;
              init_alloc_info(fs, &dp->obj);	/* Get object allocation info */
            } else
#endif
            {
              dp->obj.sclust = ld_clust(fs, dp->dir);	/* Get object allocation info */
            }
          } else {						/* This object is a file */
            res = FR_NO_PATH;
          }
        }
        if (res == FR_OK) {
          dp->obj.id = fs->id;
          res = dir_sdi(dp, 0);			/* Rewind directory */
#if FF_FS_LOCK != 0
          if (res == FR_OK) {
            if (dp->obj.sclust != 0) {
              dp->obj.lockid = inc_lock(dp, 0);	/* Lock the sub directory */
              if (!dp->obj.lockid) res = FR_TOO_MANY_OPEN_FILES;
            } else {
              dp->obj.lockid = 0;	/* Root directory need not to be locked */
            }
          }
#endif
        }
      }
      FREE_NAMBUF();
      if (res == FR_NO_FILE) res = FR_NO_PATH;
    }
    if (res != FR_OK) dp->obj.fs = 0;		/* Invalidate the directory object if function faild */
    
    LEAVE_FF(fs, res);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Close Directory                                                       */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_closedir (
                      DIR *dp		/* Pointer to the directory object to be closed */
                        )
  {
    FRESULT res;
    FATFS *fs;
    
    
    res = validate(&dp->obj, &fs);	/* Check validity of the file object */
    if (res == FR_OK) {
#if FF_FS_LOCK != 0
      if (dp->obj.lockid) res = dec_lock(dp->obj.lockid);	/* Decrement sub-directory open counter */
      if (res == FR_OK) dp->obj.fs = 0;	/* Invalidate directory object */
#else
      dp->obj.fs = 0;	/* Invalidate directory object */
#endif
#if FF_FS_REENTRANT
      unlock_fs(fs, FR_OK);		/* Unlock volume */
#endif
    }
    return res;
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Read Directory Entries in Sequence                                    */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_readdir (
                     DIR* dp,			/* Pointer to the open directory object */
                     FILINFO* fno		/* Pointer to file information to return */
                       )
  {
    FRESULT res;
    FATFS *fs;
    DEF_NAMBUF
      
      
      res = validate(&dp->obj, &fs);	/* Check validity of the directory object */
    if (res == FR_OK) {
      if (!fno) {
        res = dir_sdi(dp, 0);			/* Rewind the directory object */
      } else {
        INIT_NAMBUF(fs);
        res = dir_read_file(dp);		/* Read an item */
        if (res == FR_NO_FILE) res = FR_OK;	/* Ignore end of directory */
        if (res == FR_OK) {				/* A valid entry is found */
          get_fileinfo(dp, fno);		/* Get the object information */
          res = dir_next(dp, 0);		/* Increment index for next */
          if (res == FR_NO_FILE) res = FR_OK;	/* Ignore end of directory now */
        }
        FREE_NAMBUF();
      }
    }
    LEAVE_FF(fs, res);
  }
  
  
  
#if FF_USE_FIND
  /*-----------------------------------------------------------------------*/
  /* Find Next File                                                        */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_findnext (
                      DIR* dp,		/* Pointer to the open directory object */
                      FILINFO* fno	/* Pointer to the file information structure */
                        )
  {
    FRESULT res;
    
    
    for (;;) {
      res = f_readdir(dp, fno);		/* Get a directory item */
      if (res != FR_OK || !fno || !fno->fname[0]) break;	/* Terminate if any error or end of directory */
      if (pattern_matching(dp->pat, fno->fname, 0, 0)) break;		/* Test for the file name */
#if FF_USE_LFN && FF_USE_FIND == 2
      if (pattern_matching(dp->pat, fno->altname, 0, 0)) break;	/* Test for alternative name if exist */
#endif
    }
    return res;
  }
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Find First File                                                       */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_findfirst (
                       DIR* dp,				/* Pointer to the blank directory object */
                       FILINFO* fno,			/* Pointer to the file information structure */
                       const TCHAR* path,		/* Pointer to the directory to open */
                       const TCHAR* pattern	/* Pointer to the matching pattern */
                         )
  {
    FRESULT res;
    
    
    dp->pat = pattern;		/* Save pointer to pattern string */
    res = f_opendir(dp, path);		/* Open the target directory */
    if (res == FR_OK) {
      res = f_findnext(dp, fno);	/* Find the first item */
    }
    return res;
  }
  
#endif	/* FF_USE_FIND */
  
  
  
#if FF_FS_MINIMIZE == 0
  /*-----------------------------------------------------------------------*/
  /* Get File Status                                                       */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_stat (
                  const TCHAR* path,	/* Pointer to the file path */
                  FILINFO* fno		/* Pointer to file information to return */
                    )
  {
    FRESULT res;
    DIR dj;
    DEF_NAMBUF
      
      
      /* Get logical drive */
      res = find_volume(&path, &dj.obj.fs, 0);
    if (res == FR_OK) {
      INIT_NAMBUF(dj.obj.fs);
      res = follow_path(&dj, path);	/* Follow the file path */
      if (res == FR_OK) {				/* Follow completed */
        if (dj.fn[NSFLAG] & NS_NONAME) {	/* It is origin directory */
          res = FR_INVALID_NAME;
        } else {							/* Found an object */
          if (fno) get_fileinfo(&dj, fno);
        }
      }
      FREE_NAMBUF();
    }
    
    LEAVE_FF(dj.obj.fs, res);
  }
  
  
  
#if !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* Get Number of Free Clusters                                           */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_getfree (
                     const TCHAR* path,	/* Logical drive number */
                     DWORD* nclst,		/* Pointer to a variable to return number of free clusters */
                     FATFS** fatfs		/* Pointer to return pointer to corresponding filesystem object */
                       )
  {
    FRESULT res;
    FATFS *fs;
    DWORD nfree, clst, sect, stat;
    UINT i;
    FFOBJID obj;
    
    
    /* Get logical drive */
    res = find_volume(&path, &fs, 0);
    if (res == FR_OK) {
      *fatfs = fs;				/* Return ptr to the fs object */
      /* If free_clst is valid, return it without full FAT scan */
      if (fs->free_clst <= fs->n_fatent - 2) {
        *nclst = fs->free_clst;
      } else {
        /* Scan FAT to obtain number of free clusters */
        nfree = 0;
        if (fs->fs_type == FS_FAT12) {	/* FAT12: Scan bit field FAT entries */
          clst = 2; obj.fs = fs;
          do {
            stat = get_fat(&obj, clst);
            if (stat == 0xFFFFFFFF) { res = FR_DISK_ERR; break; }
            if (stat == 1) { res = FR_INT_ERR; break; }
            if (stat == 0) nfree++;
          } while (++clst < fs->n_fatent);
        } else {
#if FF_FS_EXFAT
          if (fs->fs_type == FS_EXFAT) {	/* exFAT: Scan allocation bitmap */
            BYTE bm;
            UINT b;
            
            clst = fs->n_fatent - 2;	/* Number of clusters */
            sect = fs->database;		/* Assuming bitmap starts at cluster 2 */
            i = 0;						/* Offset in the sector */
            do {	/* Counts numbuer of bits with zero in the bitmap */
              if (i == 0) {
                res = move_window(fs, sect++);
                if (res != FR_OK) break;
              }
              for (b = 8, bm = fs->win[i]; b && clst; b--, clst--) {
                if (!(bm & 1)) nfree++;
                bm >>= 1;
              }
              i = (i + 1) % SS(fs);
            } while (clst);
          } else
#endif
          {	/* FAT16/32: Scan WORD/DWORD FAT entries */
            clst = fs->n_fatent;	/* Number of entries */
            sect = fs->fatbase;		/* Top of the FAT */
            i = 0;					/* Offset in the sector */
            do {	/* Counts numbuer of entries with zero in the FAT */
              if (i == 0) {
                res = move_window(fs, sect++);
                if (res != FR_OK) break;
              }
              if (fs->fs_type == FS_FAT16) {
                if (ld_word(fs->win + i) == 0) nfree++;
                i += 2;
              } else {
                if ((ld_dword(fs->win + i) & 0x0FFFFFFF) == 0) nfree++;
                i += 4;
              }
              i %= SS(fs);
            } while (--clst);
          }
        }
        *nclst = nfree;			/* Return the free clusters */
        fs->free_clst = nfree;	/* Now free_clst is valid */
        fs->fsi_flag |= 1;		/* FAT32: FSInfo is to be updated */
      }
    }
    
    LEAVE_FF(fs, res);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Truncate File                                                         */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_truncate (
                      FIL* fp		/* Pointer to the file object */
                        )
  {
    FRESULT res;
    FATFS *fs;
    DWORD ncl;
    
    
    res = validate(&fp->obj, &fs);	/* Check validity of the file object */
    if (res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) LEAVE_FF(fs, res);
    if (!(fp->flag & FA_WRITE)) LEAVE_FF(fs, FR_DENIED);	/* Check access mode */
    
    if (fp->fptr < fp->obj.objsize) {	/* Process when fptr is not on the eof */
      if (fp->fptr == 0) {	/* When set file size to zero, remove entire cluster chain */
        res = remove_chain(&fp->obj, fp->obj.sclust, 0);
        fp->obj.sclust = 0;
      } else {				/* When truncate a part of the file, remove remaining clusters */
        ncl = get_fat(&fp->obj, fp->clust);
        res = FR_OK;
        if (ncl == 0xFFFFFFFF) res = FR_DISK_ERR;
        if (ncl == 1) res = FR_INT_ERR;
        if (res == FR_OK && ncl < fs->n_fatent) {
          res = remove_chain(&fp->obj, ncl, fp->clust);
        }
      }
      fp->obj.objsize = fp->fptr;	/* Set file size to current read/write point */
      fp->flag |= FA_MODIFIED;
#if !FF_FS_TINY
      if (res == FR_OK && (fp->flag & FA_DIRTY)) {
        if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) {
          res = FR_DISK_ERR;
        } else {
          fp->flag &= (BYTE)~FA_DIRTY;
        }
      }
#endif
      if (res != FR_OK) ABORT(fs, res);
    }
    
    LEAVE_FF(fs, res);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Delete a File/Directory                                               */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_unlink (
                    const TCHAR* path		/* Pointer to the file or directory path */
                      )
  {
    FRESULT res;
    DIR dj, sdj;
    DWORD dclst = 0;
    FATFS *fs;
#if FF_FS_EXFAT
    FFOBJID obj;
#endif
    DEF_NAMBUF
      
      
      /* Get logical drive */
      res = find_volume(&path, &fs, FA_WRITE);
    if (res == FR_OK) {
      dj.obj.fs = fs;
      INIT_NAMBUF(fs);
      res = follow_path(&dj, path);		/* Follow the file path */
      if (FF_FS_RPATH && res == FR_OK && (dj.fn[NSFLAG] & NS_DOT)) {
        res = FR_INVALID_NAME;			/* Cannot remove dot entry */
      }
#if FF_FS_LOCK != 0
      if (res == FR_OK) res = chk_lock(&dj, 2);	/* Check if it is an open object */
#endif
      if (res == FR_OK) {					/* The object is accessible */
        if (dj.fn[NSFLAG] & NS_NONAME) {
          res = FR_INVALID_NAME;		/* Cannot remove the origin directory */
        } else {
          if (dj.obj.attr & AM_RDO) {
            res = FR_DENIED;		/* Cannot remove R/O object */
          }
        }
        if (res == FR_OK) {
#if FF_FS_EXFAT
          obj.fs = fs;
          if (fs->fs_type == FS_EXFAT) {
            init_alloc_info(fs, &obj);
            dclst = obj.sclust;
          } else
#endif
          {
            dclst = ld_clust(fs, dj.dir);
          }
          if (dj.obj.attr & AM_DIR) {			/* Is it a sub-directory? */
#if FF_FS_RPATH != 0
            if (dclst == fs->cdir) {		 	/* Is it the current directory? */
              res = FR_DENIED;
            } else
#endif
            {
              sdj.obj.fs = fs;				/* Open the sub-directory */
              sdj.obj.sclust = dclst;
#if FF_FS_EXFAT
              if (fs->fs_type == FS_EXFAT) {
                sdj.obj.objsize = obj.objsize;
                sdj.obj.stat = obj.stat;
              }
#endif
              res = dir_sdi(&sdj, 0);
              if (res == FR_OK) {
                res = dir_read_file(&sdj);			/* Test if the directory is empty */
                if (res == FR_OK) res = FR_DENIED;	/* Not empty? */
                if (res == FR_NO_FILE) res = FR_OK;	/* Empty? */
              }
            }
          }
        }
        if (res == FR_OK) {
          res = dir_remove(&dj);			/* Remove the directory entry */
          if (res == FR_OK && dclst != 0) {	/* Remove the cluster chain if exist */
#if FF_FS_EXFAT
            res = remove_chain(&obj, dclst, 0);
#else
            res = remove_chain(&dj.obj, dclst, 0);
#endif
          }
          if (res == FR_OK) res = sync_fs(fs);
        }
      }
      FREE_NAMBUF();
    }
    
    LEAVE_FF(fs, res);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Create a Directory                                                    */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_mkdir (
                   const TCHAR* path		/* Pointer to the directory path */
                     )
  {
    FRESULT res;
    DIR dj;
    FATFS *fs;
    BYTE *dir;
    DWORD dcl, pcl, tm;
    DEF_NAMBUF
      
      
      /* Get logical drive */
      res = find_volume(&path, &fs, FA_WRITE);
    if (res == FR_OK) {
      dj.obj.fs = fs;
      INIT_NAMBUF(fs);
      res = follow_path(&dj, path);			/* Follow the file path */
      if (res == FR_OK) res = FR_EXIST;		/* Any object with same name is already existing */
      if (FF_FS_RPATH && res == FR_NO_FILE && (dj.fn[NSFLAG] & NS_DOT)) {
        res = FR_INVALID_NAME;
      }
      if (res == FR_NO_FILE) {				/* Can create a new directory */
        dcl = create_chain(&dj.obj, 0);		/* Allocate a cluster for the new directory table */
        dj.obj.objsize = (DWORD)fs->csize * SS(fs);
        res = FR_OK;
        if (dcl == 0) res = FR_DENIED;		/* No space to allocate a new cluster */
        if (dcl == 1) res = FR_INT_ERR;
        if (dcl == 0xFFFFFFFF) res = FR_DISK_ERR;
        if (res == FR_OK) res = sync_window(fs);	/* Flush FAT */
        tm = GET_FATTIME();
        if (res == FR_OK) {					/* Initialize the new directory table */
          res = dir_clear(fs, dcl);		/* Clean up the new table */
          if (res == FR_OK && (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT)) {	/* Create dot entries (FAT only) */
            dir = fs->win;
            mem_set(dir + DIR_Name, ' ', 11);	/* Create "." entry */
            dir[DIR_Name] = '.';
            dir[DIR_Attr] = AM_DIR;
            st_dword(dir + DIR_ModTime, tm);
            st_clust(fs, dir, dcl);
            mem_cpy(dir + SZDIRE, dir, SZDIRE); /* Create ".." entry */
            dir[SZDIRE + 1] = '.'; pcl = dj.obj.sclust;
            st_clust(fs, dir + SZDIRE, pcl);
            fs->wflag = 1;
          }
        }
        if (res == FR_OK) {
          res = dir_register(&dj);	/* Register the object to the directoy */
        }
        if (res == FR_OK) {
#if FF_FS_EXFAT
          if (fs->fs_type == FS_EXFAT) {	/* Initialize directory entry block */
            st_dword(fs->dirbuf + XDIR_ModTime, tm);	/* Created time */
            st_dword(fs->dirbuf + XDIR_FstClus, dcl);	/* Table start cluster */
            st_dword(fs->dirbuf + XDIR_FileSize, (DWORD)dj.obj.objsize);	/* File size needs to be valid */
            st_dword(fs->dirbuf + XDIR_ValidFileSize, (DWORD)dj.obj.objsize);
            fs->dirbuf[XDIR_GenFlags] = 3;				/* Initialize the object flag */
            fs->dirbuf[XDIR_Attr] = AM_DIR;				/* Attribute */
            res = store_xdir(&dj);
          } else
#endif
          {
            dir = dj.dir;
            st_dword(dir + DIR_ModTime, tm);	/* Created time */
            st_clust(fs, dir, dcl);				/* Table start cluster */
            dir[DIR_Attr] = AM_DIR;				/* Attribute */
            fs->wflag = 1;
          }
          if (res == FR_OK) {
            res = sync_fs(fs);
          }
        } else {
          remove_chain(&dj.obj, dcl, 0);		/* Could not register, remove cluster chain */
        }
      }
      FREE_NAMBUF();
    }
    
    LEAVE_FF(fs, res);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Rename a File/Directory                                               */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_rename (
                    const TCHAR* path_old,	/* Pointer to the object name to be renamed */
                    const TCHAR* path_new	/* Pointer to the new name */
                      )
  {
    FRESULT res;
    DIR djo, djn;
    FATFS *fs;
    BYTE buf[FF_FS_EXFAT ? SZDIRE * 2 : SZDIRE], *dir;
    DWORD dw;
    DEF_NAMBUF
      
      
      get_ldnumber(&path_new);						/* Snip the drive number of new name off */
    res = find_volume(&path_old, &fs, FA_WRITE);	/* Get logical drive of the old object */
    if (res == FR_OK) {
      djo.obj.fs = fs;
      INIT_NAMBUF(fs);
      res = follow_path(&djo, path_old);		/* Check old object */
      if (res == FR_OK && (djo.fn[NSFLAG] & (NS_DOT | NS_NONAME))) res = FR_INVALID_NAME;	/* Check validity of name */
#if FF_FS_LOCK != 0
      if (res == FR_OK) {
        res = chk_lock(&djo, 2);
      }
#endif
      if (res == FR_OK) {						/* Object to be renamed is found */
#if FF_FS_EXFAT
        if (fs->fs_type == FS_EXFAT) {	/* At exFAT volume */
          BYTE nf, nn;
          WORD nh;
          
          mem_cpy(buf, fs->dirbuf, SZDIRE * 2);	/* Save 85+C0 entry of old object */
          mem_cpy(&djn, &djo, sizeof djo);
          res = follow_path(&djn, path_new);		/* Make sure if new object name is not in use */
          if (res == FR_OK) {						/* Is new name already in use by any other object? */
            res = (djn.obj.sclust == djo.obj.sclust && djn.dptr == djo.dptr) ? FR_NO_FILE : FR_EXIST;
          }
          if (res == FR_NO_FILE) { 				/* It is a valid path and no name collision */
            res = dir_register(&djn);			/* Register the new entry */
            if (res == FR_OK) {
              nf = fs->dirbuf[XDIR_NumSec]; nn = fs->dirbuf[XDIR_NumName];
              nh = ld_word(fs->dirbuf + XDIR_NameHash);
              mem_cpy(fs->dirbuf, buf, SZDIRE * 2);	/* Restore 85+C0 entry */
              fs->dirbuf[XDIR_NumSec] = nf; fs->dirbuf[XDIR_NumName] = nn;
              st_word(fs->dirbuf + XDIR_NameHash, nh);
              if (!(fs->dirbuf[XDIR_Attr] & AM_DIR)) fs->dirbuf[XDIR_Attr] |= AM_ARC;	/* Set archive attribute if it is a file */
              /* Start of critical section where an interruption can cause a cross-link */
              res = store_xdir(&djn);
            }
          }
        } else
#endif
        {	/* At FAT/FAT32 volume */
          mem_cpy(buf, djo.dir, SZDIRE);			/* Save directory entry of the object */
          mem_cpy(&djn, &djo, sizeof (DIR));		/* Duplicate the directory object */
          res = follow_path(&djn, path_new);		/* Make sure if new object name is not in use */
          if (res == FR_OK) {						/* Is new name already in use by any other object? */
            res = (djn.obj.sclust == djo.obj.sclust && djn.dptr == djo.dptr) ? FR_NO_FILE : FR_EXIST;
          }
          if (res == FR_NO_FILE) { 				/* It is a valid path and no name collision */
            res = dir_register(&djn);			/* Register the new entry */
            if (res == FR_OK) {
              dir = djn.dir;					/* Copy directory entry of the object except name */
              mem_cpy(dir + 13, buf + 13, SZDIRE - 13);
              dir[DIR_Attr] = buf[DIR_Attr];
              if (!(dir[DIR_Attr] & AM_DIR)) dir[DIR_Attr] |= AM_ARC;	/* Set archive attribute if it is a file */
              fs->wflag = 1;
              if ((dir[DIR_Attr] & AM_DIR) && djo.obj.sclust != djn.obj.sclust) {	/* Update .. entry in the sub-directory if needed */
                dw = clst2sect(fs, ld_clust(fs, dir));
                if (dw == 0) {
                  res = FR_INT_ERR;
                } else {
                  /* Start of critical section where an interruption can cause a cross-link */
                  res = move_window(fs, dw);
                  dir = fs->win + SZDIRE * 1;	/* Ptr to .. entry */
                  if (res == FR_OK && dir[1] == '.') {
                    st_clust(fs, dir, djn.obj.sclust);
                    fs->wflag = 1;
                  }
                }
              }
            }
          }
        }
        if (res == FR_OK) {
          res = dir_remove(&djo);		/* Remove old entry */
          if (res == FR_OK) {
            res = sync_fs(fs);
          }
        }
        /* End of the critical section */
      }
      FREE_NAMBUF();
    }
    
    LEAVE_FF(fs, res);
  }
  
#endif /* !FF_FS_READONLY */
#endif /* FF_FS_MINIMIZE == 0 */
#endif /* FF_FS_MINIMIZE <= 1 */
#endif /* FF_FS_MINIMIZE <= 2 */
  
  
  
#if FF_USE_CHMOD && !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* Change Attribute                                                      */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_chmod (
                   const TCHAR* path,	/* Pointer to the file path */
                   BYTE attr,			/* Attribute bits */
                   BYTE mask			/* Attribute mask to change */
                     )
  {
    FRESULT res;
    DIR dj;
    FATFS *fs;
    DEF_NAMBUF
      
      
      res = find_volume(&path, &fs, FA_WRITE);	/* Get logical drive */
    if (res == FR_OK) {
      dj.obj.fs = fs;
      INIT_NAMBUF(fs);
      res = follow_path(&dj, path);	/* Follow the file path */
      if (res == FR_OK && (dj.fn[NSFLAG] & (NS_DOT | NS_NONAME))) res = FR_INVALID_NAME;	/* Check object validity */
      if (res == FR_OK) {
        mask &= AM_RDO|AM_HID|AM_SYS|AM_ARC;	/* Valid attribute mask */
#if FF_FS_EXFAT
        if (fs->fs_type == FS_EXFAT) {
          fs->dirbuf[XDIR_Attr] = (attr & mask) | (fs->dirbuf[XDIR_Attr] & (BYTE)~mask);	/* Apply attribute change */
          res = store_xdir(&dj);
        } else
#endif
        {
          dj.dir[DIR_Attr] = (attr & mask) | (dj.dir[DIR_Attr] & (BYTE)~mask);	/* Apply attribute change */
          fs->wflag = 1;
        }
        if (res == FR_OK) {
          res = sync_fs(fs);
        }
      }
      FREE_NAMBUF();
    }
    
    LEAVE_FF(fs, res);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Change Timestamp                                                      */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_utime (
                   const TCHAR* path,	/* Pointer to the file/directory name */
                   const FILINFO* fno	/* Pointer to the timestamp to be set */
                     )
  {
    FRESULT res;
    DIR dj;
    FATFS *fs;
    DEF_NAMBUF
      
      
      res = find_volume(&path, &fs, FA_WRITE);	/* Get logical drive */
    if (res == FR_OK) {
      dj.obj.fs = fs;
      INIT_NAMBUF(fs);
      res = follow_path(&dj, path);	/* Follow the file path */
      if (res == FR_OK && (dj.fn[NSFLAG] & (NS_DOT | NS_NONAME))) res = FR_INVALID_NAME;	/* Check object validity */
      if (res == FR_OK) {
#if FF_FS_EXFAT
        if (fs->fs_type == FS_EXFAT) {
          st_dword(fs->dirbuf + XDIR_ModTime, (DWORD)fno->fdate << 16 | fno->ftime);
          res = store_xdir(&dj);
        } else
#endif
        {
          st_dword(dj.dir + DIR_ModTime, (DWORD)fno->fdate << 16 | fno->ftime);
          fs->wflag = 1;
        }
        if (res == FR_OK) {
          res = sync_fs(fs);
        }
      }
      FREE_NAMBUF();
    }
    
    LEAVE_FF(fs, res);
  }
  
#endif	/* FF_USE_CHMOD && !FF_FS_READONLY */
  
  
  
#if FF_USE_LABEL
  /*-----------------------------------------------------------------------*/
  /* Get Volume Label                                                      */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_getlabel (
                      const TCHAR* path,	/* Logical drive number */
                      TCHAR* label,		/* Buffer to store the volume label */
                      DWORD* vsn			/* Variable to store the volume serial number */
                        )
  {
    FRESULT res;
    DIR dj;
    FATFS *fs;
    UINT si, di;
    WCHAR wc;
    
    /* Get logical drive */
    res = find_volume(&path, &fs, 0);
    
    /* Get volume label */
    if (res == FR_OK && label) {
      dj.obj.fs = fs; dj.obj.sclust = 0;	/* Open root directory */
      res = dir_sdi(&dj, 0);
      if (res == FR_OK) {
        res = dir_read_label(&dj);		/* Find a volume label entry */
        if (res == FR_OK) {
#if FF_FS_EXFAT
          if (fs->fs_type == FS_EXFAT) {
            WCHAR hs;
            
            for (si = di = hs = 0; si < dj.dir[XDIR_NumLabel]; si++) {	/* Extract volume label from 83 entry */
              wc = ld_word(dj.dir + XDIR_Label + si * 2);
              if (hs == 0 && IsSurrogate(wc)) {	/* Is the code a surrogate? */
                hs = wc; continue;
              }
              wc = put_utf((DWORD)hs << 16 | wc, &label[di], 4);
              if (wc == 0) { di = 0; break; }
              di += wc;
              hs = 0;
            }
            if (hs != 0) di = 0;	/* Broken surrogate pair? */
            label[di] = 0;
          } else
#endif
          {
            si = di = 0;		/* Extract volume label from AM_VOL entry */
            while (si < 11) {
              wc = dj.dir[si++];
#if FF_USE_LFN && FF_LFN_UNICODE >= 1 	/* Unicode output */
              if (dbc_1st((BYTE)wc) && si < 11) wc = wc << 8 | dj.dir[si++];	/* Is it a DBC? */
              wc = ff_oem2uni(wc, CODEPAGE);
              if (wc != 0) wc = put_utf(wc, &label[di], 4);
              if (wc == 0) { di = 0; break; }
              di += wc;
#else									/* ANSI/OEM output */
              label[di++] = (TCHAR)wc;
#endif
            }
            do {				/* Truncate trailing spaces */
              label[di] = 0;
              if (di == 0) break;
            } while (label[--di] == ' ');
          }
        }
      }
      if (res == FR_NO_FILE) {	/* No label entry and return nul string */
        label[0] = 0;
        res = FR_OK;
      }
    }
    
    /* Get volume serial number */
    if (res == FR_OK && vsn) {
      res = move_window(fs, fs->volbase);
      if (res == FR_OK) {
        switch (fs->fs_type) {
        case FS_EXFAT:
          di = BPB_VolIDEx; break;
          
        case FS_FAT32:
          di = BS_VolID32; break;
          
        default:
          di = BS_VolID;
        }
        *vsn = ld_dword(fs->win + di);
      }
    }
    
    LEAVE_FF(fs, res);
  }
  
  
  
#if !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* Set Volume Label                                                      */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_setlabel (
                      const TCHAR* label	/* Volume label to set with heading logical drive number */
                        )
  {
    FRESULT res;
    DIR dj;
    FATFS *fs;
    BYTE dirvn[22];
    UINT di;
    WCHAR wc;
    static const char badchr[] = "+.,;=[]\"*:<>\?|\x7F";	/* [0..] for FAT, [7..] for exFAT */
#if FF_USE_LFN
    DWORD dc;
#endif
    
    /* Get logical drive */
    res = find_volume(&label, &fs, FA_WRITE);
    if (res != FR_OK) LEAVE_FF(fs, res);
    
#if FF_FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
      mem_set(dirvn, 0, 22);
      di = 0;
      while (*label) {	/* Create volume label in directory form */
        dc = tchar2uni(&label);	/* Get a Unicode character */
        if (dc >= 0x10000) {
          if (dc == 0xFFFFFFFF || di >= 10) {	/* Wrong surrogate or buffer overflow */
            dc = 0;
          } else {
            st_word(dirvn + di * 2, (WCHAR)(dc >> 16)); di++;
          }
        }
        if (dc == 0 || chk_chr(badchr + 7, (int)dc) || di >= 11) {	/* Check validity of the volume label */
          LEAVE_FF(fs, FR_INVALID_NAME);
        }
        st_word(dirvn + di * 2, (WCHAR)dc); di++;
      }
    } else
#endif
    {	/* On the FAT/FAT32 volume */
      mem_set(dirvn, ' ', 11);
      di = 0;
      while (*label) {	/* Create volume label in directory form */
#if FF_USE_LFN
        dc = tchar2uni(&label);
        wc = (dc < 0x10000) ? ff_uni2oem(ff_wtoupper(dc), CODEPAGE) : 0;
#else									/* ANSI/OEM input */
        wc = (BYTE)*label++;
        if (dbc_1st((BYTE)wc)) wc = dbc_2nd((BYTE)*label) ? wc << 8 | (BYTE)*label++ : 0;
        if (IsLower(wc)) wc -= 0x20;		/* To upper ASCII characters */
#if FF_CODE_PAGE == 0
        if (ExCvt && wc >= 0x80) wc = ExCvt[wc - 0x80];	/* To upper extended characters (SBCS cfg) */
#elif FF_CODE_PAGE < 900
        if (wc >= 0x80) wc = ExCvt[wc - 0x80];	/* To upper extended characters (SBCS cfg) */
#endif
#endif
        if (wc == 0 || chk_chr(badchr + 0, (int)wc) || di >= (UINT)((wc >= 0x100) ? 10 : 11)) {	/* Reject invalid characters for volume label */
          LEAVE_FF(fs, FR_INVALID_NAME);
        }
        if (wc >= 0x100) dirvn[di++] = (BYTE)(wc >> 8);
        dirvn[di++] = (BYTE)wc;
      }
      if (dirvn[0] == DDEM) LEAVE_FF(fs, FR_INVALID_NAME);	/* Reject illegal name (heading DDEM) */
      while (di && dirvn[di - 1] == ' ') di--;				/* Snip trailing spaces */
    }
    
    /* Set volume label */
    dj.obj.fs = fs; dj.obj.sclust = 0;	/* Open root directory */
    res = dir_sdi(&dj, 0);
    if (res == FR_OK) {
      res = dir_read_label(&dj);	/* Get volume label entry */
      if (res == FR_OK) {
        if (FF_FS_EXFAT && fs->fs_type == FS_EXFAT) {
          dj.dir[XDIR_NumLabel] = (BYTE)di;	/* Change the volume label */
          mem_cpy(dj.dir + XDIR_Label, dirvn, 22);
        } else {
          if (di != 0) {
            mem_cpy(dj.dir, dirvn, 11);	/* Change the volume label */
          } else {
            dj.dir[DIR_Name] = DDEM;	/* Remove the volume label */
          }
        }
        fs->wflag = 1;
        res = sync_fs(fs);
      } else {			/* No volume label entry or an error */
        if (res == FR_NO_FILE) {
          res = FR_OK;
          if (di != 0) {	/* Create a volume label entry */
            res = dir_alloc(&dj, 1);	/* Allocate an entry */
            if (res == FR_OK) {
              mem_set(dj.dir, 0, SZDIRE);	/* Clean the entry */
              if (FF_FS_EXFAT && fs->fs_type == FS_EXFAT) {
                dj.dir[XDIR_Type] = 0x83;		/* Create 83 entry */
                dj.dir[XDIR_NumLabel] = (BYTE)di;
                mem_cpy(dj.dir + XDIR_Label, dirvn, 22);
              } else {
                dj.dir[DIR_Attr] = AM_VOL;		/* Create volume label entry */
                mem_cpy(dj.dir, dirvn, 11);
              }
              fs->wflag = 1;
              res = sync_fs(fs);
            }
          }
        }
      }
    }
    
    LEAVE_FF(fs, res);
  }
  
#endif /* !FF_FS_READONLY */
#endif /* FF_USE_LABEL */
  
  
  
#if FF_USE_EXPAND && !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* Allocate a Contiguous Blocks to the File                              */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_expand (
                    FIL* fp,		/* Pointer to the file object */
                    FSIZE_t fsz,	/* File size to be expanded to */
                    BYTE opt		/* Operation mode 0:Find and prepare or 1:Find and allocate */
                      )
  {
    FRESULT res;
    FATFS *fs;
    DWORD n, clst, stcl, scl, ncl, tcl, lclst;
    
    
    res = validate(&fp->obj, &fs);		/* Check validity of the file object */
    if (res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) LEAVE_FF(fs, res);
    if (fsz == 0 || fp->obj.objsize != 0 || !(fp->flag & FA_WRITE)) LEAVE_FF(fs, FR_DENIED);
#if FF_FS_EXFAT
    if (fs->fs_type != FS_EXFAT && fsz >= 0x100000000) LEAVE_FF(fs, FR_DENIED);	/* Check if in size limit */
#endif
    n = (DWORD)fs->csize * SS(fs);	/* Cluster size */
    tcl = (DWORD)(fsz / n) + ((fsz & (n - 1)) ? 1 : 0);	/* Number of clusters required */
    stcl = fs->last_clst; lclst = 0;
    if (stcl < 2 || stcl >= fs->n_fatent) stcl = 2;
    
#if FF_FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {
      scl = find_bitmap(fs, stcl, tcl);			/* Find a contiguous cluster block */
      if (scl == 0) res = FR_DENIED;				/* No contiguous cluster block was found */
      if (scl == 0xFFFFFFFF) res = FR_DISK_ERR;
      if (res == FR_OK) {	/* A contiguous free area is found */
        if (opt) {		/* Allocate it now */
          res = change_bitmap(fs, scl, tcl, 1);	/* Mark the cluster block 'in use' */
          lclst = scl + tcl - 1;
        } else {		/* Set it as suggested point for next allocation */
          lclst = scl - 1;
        }
      }
    } else
#endif
    {
      scl = clst = stcl; ncl = 0;
      for (;;) {	/* Find a contiguous cluster block */
        n = get_fat(&fp->obj, clst);
        if (++clst >= fs->n_fatent) clst = 2;
        if (n == 1) { res = FR_INT_ERR; break; }
        if (n == 0xFFFFFFFF) { res = FR_DISK_ERR; break; }
        if (n == 0) {	/* Is it a free cluster? */
          if (++ncl == tcl) break;	/* Break if a contiguous cluster block is found */
        } else {
          scl = clst; ncl = 0;		/* Not a free cluster */
        }
        if (clst == stcl) { res = FR_DENIED; break; }	/* No contiguous cluster? */
      }
      if (res == FR_OK) {	/* A contiguous free area is found */
        if (opt) {		/* Allocate it now */
          for (clst = scl, n = tcl; n; clst++, n--) {	/* Create a cluster chain on the FAT */
            res = put_fat(fs, clst, (n == 1) ? 0xFFFFFFFF : clst + 1);
            if (res != FR_OK) break;
            lclst = clst;
          }
        } else {		/* Set it as suggested point for next allocation */
          lclst = scl - 1;
        }
      }
    }
    
    if (res == FR_OK) {
      fs->last_clst = lclst;		/* Set suggested start cluster to start next */
      if (opt) {	/* Is it allocated now? */
        fp->obj.sclust = scl;		/* Update object allocation information */
        fp->obj.objsize = fsz;
        if (FF_FS_EXFAT) fp->obj.stat = 2;	/* Set status 'contiguous chain' */
        fp->flag |= FA_MODIFIED;
        if (fs->free_clst <= fs->n_fatent - 2) {	/* Update FSINFO */
          fs->free_clst -= tcl;
          fs->fsi_flag |= 1;
        }
      }
    }
    
    LEAVE_FF(fs, res);
  }
  
#endif /* FF_USE_EXPAND && !FF_FS_READONLY */
  
  
  
#if FF_USE_FORWARD
  /*-----------------------------------------------------------------------*/
  /* Forward Data to the Stream Directly                                   */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_forward (
                     FIL* fp, 						/* Pointer to the file object */
                     UINT (*func)(const BYTE*,UINT),	/* Pointer to the streaming function */
                     UINT btf,						/* Number of bytes to forward */
                     UINT* bf						/* Pointer to number of bytes forwarded */
                       )
  {
    FRESULT res;
    FATFS *fs;
    DWORD clst, sect;
    FSIZE_t remain;
    UINT rcnt, csect;
    BYTE *dbuf;
    
    
    *bf = 0;	/* Clear transfer byte counter */
    res = validate(&fp->obj, &fs);		/* Check validity of the file object */
    if (res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) LEAVE_FF(fs, res);
    if (!(fp->flag & FA_READ)) LEAVE_FF(fs, FR_DENIED);	/* Check access mode */
    
    remain = fp->obj.objsize - fp->fptr;
    if (btf > remain) btf = (UINT)remain;			/* Truncate btf by remaining bytes */
    
    for ( ;  btf && (*func)(0, 0);					/* Repeat until all data transferred or stream goes busy */
    fp->fptr += rcnt, *bf += rcnt, btf -= rcnt) {
      csect = (UINT)(fp->fptr / SS(fs) & (fs->csize - 1));	/* Sector offset in the cluster */
      if (fp->fptr % SS(fs) == 0) {				/* On the sector boundary? */
        if (csect == 0) {						/* On the cluster boundary? */
          clst = (fp->fptr == 0) ?			/* On the top of the file? */
            fp->obj.sclust : get_fat(&fp->obj, fp->clust);
            if (clst <= 1) ABORT(fs, FR_INT_ERR);
            if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
            fp->clust = clst;					/* Update current cluster */
        }
      }
      sect = clst2sect(fs, fp->clust);			/* Get current data sector */
      if (sect == 0) ABORT(fs, FR_INT_ERR);
      sect += csect;
#if FF_FS_TINY
      if (move_window(fs, sect) != FR_OK) ABORT(fs, FR_DISK_ERR);	/* Move sector window to the file data */
      dbuf = fs->win;
#else
      if (fp->sect != sect) {		/* Fill sector cache with file data */
#if !FF_FS_READONLY
        if (fp->flag & FA_DIRTY) {		/* Write-back dirty sector cache */
          if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
          fp->flag &= (BYTE)~FA_DIRTY;
        }
#endif
        if (disk_read(fs->pdrv, fp->buf, sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
      }
      dbuf = fp->buf;
#endif
      fp->sect = sect;
      rcnt = SS(fs) - (UINT)fp->fptr % SS(fs);	/* Number of bytes left in the sector */
      if (rcnt > btf) rcnt = btf;					/* Clip it by btr if needed */
      rcnt = (*func)(dbuf + ((UINT)fp->fptr % SS(fs)), rcnt);	/* Forward the file data */
      if (rcnt == 0) ABORT(fs, FR_INT_ERR);
    }
    
    LEAVE_FF(fs, FR_OK);
  }
#endif /* FF_USE_FORWARD */
  
  
  
#if FF_USE_MKFS && !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* Create an FAT/exFAT volume                                            */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_mkfs (
                  const TCHAR* path,	/* Logical drive number */
                  BYTE opt,			/* Format option */
                  DWORD au,			/* Size of allocation unit (cluster) [byte] */
                  void* work,			/* Pointer to working buffer (null: use heap memory) */
                  UINT len			/* Size of working buffer [byte] */
                    )
  {
    const UINT n_fats = 1;		/* Number of FATs for FAT/FAT32 volume (1 or 2) */
    const UINT n_rootdir = 512;	/* Number of root directory entries for FAT volume */
    static const WORD cst[] = {1, 4, 16, 64, 256, 512, 0};	/* Cluster size boundary for FAT volume (4Ks unit) */
    static const WORD cst32[] = {1, 2, 4, 8, 16, 32, 0};	/* Cluster size boundary for FAT32 volume (128Ks unit) */
    BYTE fmt, sys, *buf, *pte, pdrv, part;
    WORD ss;	/* Sector size */
    DWORD szb_buf, sz_buf, sz_blk, n_clst, pau, sect, nsect, n;
    DWORD b_vol, b_fat, b_data;				/* Base LBA for volume, fat, data */
    DWORD sz_vol, sz_rsv, sz_fat, sz_dir;	/* Size for volume, fat, dir, data */
    UINT i;
    int vol;
    DSTATUS stat;
#if FF_USE_TRIM || FF_FS_EXFAT
    DWORD tbl[3];
#endif
    
    
    /* Check mounted drive and clear work area */
    vol = get_ldnumber(&path);					/* Get target logical drive */
    if (vol < 0) return FR_INVALID_DRIVE;
    if (FatFs[vol]) FatFs[vol]->fs_type = 0;	/* Clear the volume if mounted */
    pdrv = LD2PD(vol);	/* Physical drive */
    part = LD2PT(vol);	/* Partition (0:create as new, 1-4:get from partition table) */
    
    /* Check physical drive status */
    stat = disk_initialize(pdrv);
    if (stat & STA_NOINIT) return FR_NOT_READY;
    if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
    if (disk_ioctl(pdrv, GET_BLOCK_SIZE, &sz_blk) != RES_OK || !sz_blk || sz_blk > 32768 || (sz_blk & (sz_blk - 1))) sz_blk = 1;	/* Erase block to align data area */
#if FF_MAX_SS != FF_MIN_SS		/* Get sector size of the medium if variable sector size cfg. */
    if (disk_ioctl(pdrv, GET_SECTOR_SIZE, &ss) != RES_OK) return FR_DISK_ERR;
    if (ss > FF_MAX_SS || ss < FF_MIN_SS || (ss & (ss - 1))) return FR_DISK_ERR;
#else
    ss = FF_MAX_SS;
#endif
    if ((au != 0 && au < ss) || au > 0x1000000 || (au & (au - 1))) return FR_INVALID_PARAMETER;	/* Check if au is valid */
    au /= ss;	/* Cluster size in unit of sector */
    
    /* Get working buffer */
#if FF_USE_LFN == 3
    if (!work) {	/* Use heap memory for working buffer */
      for (szb_buf = MAX_MALLOC, buf = 0; szb_buf >= ss && !(buf = ff_memalloc(szb_buf)); szb_buf /= 2) ;
      sz_buf = szb_buf / ss;		/* Size of working buffer (sector) */
    } else
#endif
    {
      buf = (BYTE*)work;		/* Working buffer */
      sz_buf = len / ss;		/* Size of working buffer (sector) */
      szb_buf = sz_buf * ss;	/* Size of working buffer (byte) */
    }
    if (!buf || sz_buf == 0) return FR_NOT_ENOUGH_CORE;
    
    /* Determine where the volume to be located (b_vol, sz_vol) */
    if (FF_MULTI_PARTITION && part != 0) {
      /* Get partition information from partition table in the MBR */
      if (disk_read(pdrv, buf, 0, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Load MBR */
      if (ld_word(buf + BS_55AA) != 0xAA55) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Check if MBR is valid */
      pte = buf + (MBR_Table + (part - 1) * SZ_PTE);
      if (pte[PTE_System] == 0) LEAVE_MKFS(FR_MKFS_ABORTED);	/* No partition? */
      b_vol = ld_dword(pte + PTE_StLba);		/* Get volume start sector */
      sz_vol = ld_dword(pte + PTE_SizLba);	/* Get volume size */
    } else {
      /* Create a single-partition in this function */
      if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_vol) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
      b_vol = (opt & FM_SFD) ? 0 : 63;		/* Volume start sector */
      if (sz_vol < b_vol) LEAVE_MKFS(FR_MKFS_ABORTED);
      sz_vol -= b_vol;						/* Volume size */
    }
    if (sz_vol < 128) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Check if volume size is >=128s */
    
    /* Pre-determine the FAT type */
    do {
      if (FF_FS_EXFAT && (opt & FM_EXFAT)) {	/* exFAT possible? */
        if ((opt & FM_ANY) == FM_EXFAT || sz_vol >= 0x4000000 || au > 128) {	/* exFAT only, vol >= 64Ms or au > 128s ? */
          fmt = FS_EXFAT; break;
        }
      }
      if (au > 128) LEAVE_MKFS(FR_INVALID_PARAMETER);	/* Too large au for FAT/FAT32 */
      if (opt & FM_FAT32) {	/* FAT32 possible? */
        if ((opt & FM_ANY) == FM_FAT32 || !(opt & FM_FAT)) {	/* FAT32 only or no-FAT? */
          fmt = FS_FAT32; break;
        }
      }
      if (!(opt & FM_FAT)) LEAVE_MKFS(FR_INVALID_PARAMETER);	/* no-FAT? */
      fmt = FS_FAT16;
    } while (0);
    
#if FF_FS_EXFAT
    if (fmt == FS_EXFAT) {	/* Create an exFAT volume */
      DWORD szb_bit, szb_case, sum, nb, cl;
      WCHAR ch, si;
      UINT j, st;
      BYTE b;
      
      if (sz_vol < 0x1000) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too small volume? */
#if FF_USE_TRIM
      tbl[0] = b_vol; tbl[1] = b_vol + sz_vol - 1;	/* Inform the device the volume area may be erased */
      disk_ioctl(pdrv, CTRL_TRIM, tbl);
#endif
      /* Determine FAT location, data location and number of clusters */
      if (au == 0) {	/* au auto-selection */
        au = 8;
        if (sz_vol >= 0x80000) au = 64;		/* >= 512Ks */
        if (sz_vol >= 0x4000000) au = 256;	/* >= 64Ms */
      }
      b_fat = b_vol + 32;										/* FAT start at offset 32 */
      sz_fat = ((sz_vol / au + 2) * 4 + ss - 1) / ss;			/* Number of FAT sectors */
      b_data = (b_fat + sz_fat + sz_blk - 1) & ~(sz_blk - 1);	/* Align data area to the erase block boundary */
      if (b_data >= sz_vol / 2) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too small volume? */
      n_clst = (sz_vol - (b_data - b_vol)) / au;				/* Number of clusters */
      if (n_clst <16) LEAVE_MKFS(FR_MKFS_ABORTED);			/* Too few clusters? */
      if (n_clst > MAX_EXFAT) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too many clusters? */
      
      szb_bit = (n_clst + 7) / 8;						/* Size of allocation bitmap */
      tbl[0] = (szb_bit + au * ss - 1) / (au * ss);	/* Number of allocation bitmap clusters */
      
      /* Create a compressed up-case table */
      sect = b_data + au * tbl[0];	/* Table start sector */
      sum = 0;						/* Table checksum to be stored in the 82 entry */
      st = si = i = j = szb_case = 0;
      do {
        switch (st) {
        case 0:
          ch = (WCHAR)ff_wtoupper(si);	/* Get an up-case char */
          if (ch != si) {
            si++; break;		/* Store the up-case char if exist */
          }
          for (j = 1; (WCHAR)(si + j) && (WCHAR)(si + j) == ff_wtoupper((WCHAR)(si + j)); j++) ;	/* Get run length of no-case block */
          if (j >= 128) {
            ch = 0xFFFF; st = 2; break;	/* Compress the no-case block if run is >= 128 */
          }
          st = 1;			/* Do not compress short run */
          /* go to next case */
        case 1:
          ch = si++;		/* Fill the short run */
          if (--j == 0) st = 0;
          break;
          
        default:
          ch = (WCHAR)j; si += j;	/* Number of chars to skip */
          st = 0;
        }
        sum = xsum32(buf[i + 0] = (BYTE)ch, sum);		/* Put it into the write buffer */
        sum = xsum32(buf[i + 1] = (BYTE)(ch >> 8), sum);
        i += 2; szb_case += 2;
        if (si == 0 || i == szb_buf) {		/* Write buffered data when buffer full or end of process */
          n = (i + ss - 1) / ss;
          if (disk_write(pdrv, buf, sect, n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
          sect += n; i = 0;
        }
      } while (si);
      tbl[1] = (szb_case + au * ss - 1) / (au * ss);	/* Number of up-case table clusters */
      tbl[2] = 1;										/* Number of root dir clusters */
      
      /* Initialize the allocation bitmap */
      sect = b_data; nsect = (szb_bit + ss - 1) / ss;	/* Start of bitmap and number of sectors */
      nb = tbl[0] + tbl[1] + tbl[2];					/* Number of clusters in-use by system */
      do {
        mem_set(buf, 0, szb_buf);
        for (i = 0; nb >= 8 && i < szb_buf; buf[i++] = 0xFF, nb -= 8) ;
        for (b = 1; nb != 0 && i < szb_buf; buf[i] |= b, b <<= 1, nb--) ;
        n = (nsect > sz_buf) ? sz_buf : nsect;		/* Write the buffered data */
        if (disk_write(pdrv, buf, sect, n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
        sect += n; nsect -= n;
      } while (nsect);
      
      /* Initialize the FAT */
      sect = b_fat; nsect = sz_fat;	/* Start of FAT and number of FAT sectors */
      j = nb = cl = 0;
      do {
        mem_set(buf, 0, szb_buf); i = 0;	/* Clear work area and reset write index */
        if (cl == 0) {	/* Set entry 0 and 1 */
          st_dword(buf + i, 0xFFFFFFF8); i += 4; cl++;
          st_dword(buf + i, 0xFFFFFFFF); i += 4; cl++;
        }
        do {			/* Create chains of bitmap, up-case and root dir */
          while (nb != 0 && i < szb_buf) {			/* Create a chain */
            st_dword(buf + i, (nb > 1) ? cl + 1 : 0xFFFFFFFF);
            i += 4; cl++; nb--;
          }
          if (nb == 0 && j < 3) nb = tbl[j++];	/* Next chain */
        } while (nb != 0 && i < szb_buf);
        n = (nsect > sz_buf) ? sz_buf : nsect;	/* Write the buffered data */
        if (disk_write(pdrv, buf, sect, n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
        sect += n; nsect -= n;
      } while (nsect);
      
      /* Initialize the root directory */
      mem_set(buf, 0, szb_buf);
      buf[SZDIRE * 0 + 0] = 0x83;		/* 83 entry (volume label) */
      buf[SZDIRE * 1 + 0] = 0x81;		/* 81 entry (allocation bitmap) */
      st_dword(buf + SZDIRE * 1 + 20, 2);
      st_dword(buf + SZDIRE * 1 + 24, szb_bit);
      buf[SZDIRE * 2 + 0] = 0x82;		/* 82 entry (up-case table) */
      st_dword(buf + SZDIRE * 2 + 4, sum);
      st_dword(buf + SZDIRE * 2 + 20, 2 + tbl[0]);
      st_dword(buf + SZDIRE * 2 + 24, szb_case);
      sect = b_data + au * (tbl[0] + tbl[1]);	nsect = au;	/* Start of the root directory and number of sectors */
      do {	/* Fill root directory sectors */
        n = (nsect > sz_buf) ? sz_buf : nsect;
        if (disk_write(pdrv, buf, sect, n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
        mem_set(buf, 0, ss);
        sect += n; nsect -= n;
      } while (nsect);
      
      /* Create two set of the exFAT VBR blocks */
      sect = b_vol;
      for (n = 0; n < 2; n++) {
        /* Main record (+0) */
        mem_set(buf, 0, ss);
        mem_cpy(buf + BS_JmpBoot, "\xEB\x76\x90" "EXFAT   ", 11);	/* Boot jump code (x86), OEM name */
        st_dword(buf + BPB_VolOfsEx, b_vol);					/* Volume offset in the physical drive [sector] */
        st_dword(buf + BPB_TotSecEx, sz_vol);					/* Volume size [sector] */
        st_dword(buf + BPB_FatOfsEx, b_fat - b_vol);			/* FAT offset [sector] */
        st_dword(buf + BPB_FatSzEx, sz_fat);					/* FAT size [sector] */
        st_dword(buf + BPB_DataOfsEx, b_data - b_vol);			/* Data offset [sector] */
        st_dword(buf + BPB_NumClusEx, n_clst);					/* Number of clusters */
        st_dword(buf + BPB_RootClusEx, 2 + tbl[0] + tbl[1]);	/* Root dir cluster # */
        st_dword(buf + BPB_VolIDEx, GET_FATTIME());				/* VSN */
        st_word(buf + BPB_FSVerEx, 0x100);						/* Filesystem version (1.00) */
        for (buf[BPB_BytsPerSecEx] = 0, i = ss; i >>= 1; buf[BPB_BytsPerSecEx]++) ;	/* Log2 of sector size [byte] */
        for (buf[BPB_SecPerClusEx] = 0, i = au; i >>= 1; buf[BPB_SecPerClusEx]++) ;	/* Log2 of cluster size [sector] */
        buf[BPB_NumFATsEx] = 1;					/* Number of FATs */
        buf[BPB_DrvNumEx] = 0x80;				/* Drive number (for int13) */
        st_word(buf + BS_BootCodeEx, 0xFEEB);	/* Boot code (x86) */
        st_word(buf + BS_55AA, 0xAA55);			/* Signature (placed here regardless of sector size) */
        for (i = sum = 0; i < ss; i++) {		/* VBR checksum */
          if (i != BPB_VolFlagEx && i != BPB_VolFlagEx + 1 && i != BPB_PercInUseEx) sum = xsum32(buf[i], sum);
        }
        if (disk_write(pdrv, buf, sect++, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
        /* Extended bootstrap record (+1..+8) */
        mem_set(buf, 0, ss);
        st_word(buf + ss - 2, 0xAA55);	/* Signature (placed at end of sector) */
        for (j = 1; j < 9; j++) {
          for (i = 0; i < ss; sum = xsum32(buf[i++], sum)) ;	/* VBR checksum */
          if (disk_write(pdrv, buf, sect++, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
        }
        /* OEM/Reserved record (+9..+10) */
        mem_set(buf, 0, ss);
        for ( ; j < 11; j++) {
          for (i = 0; i < ss; sum = xsum32(buf[i++], sum)) ;	/* VBR checksum */
          if (disk_write(pdrv, buf, sect++, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
        }
        /* Sum record (+11) */
        for (i = 0; i < ss; i += 4) st_dword(buf + i, sum);		/* Fill with checksum value */
        if (disk_write(pdrv, buf, sect++, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
      }
      
    } else
#endif	/* FF_FS_EXFAT */
    {	/* Create an FAT/FAT32 volume */
      do {
        pau = au;
        /* Pre-determine number of clusters and FAT sub-type */
        if (fmt == FS_FAT32) {	/* FAT32 volume */
          if (pau == 0) {	/* au auto-selection */
            n = sz_vol / 0x20000;	/* Volume size in unit of 128KS */
            for (i = 0, pau = 1; cst32[i] && cst32[i] <= n; i++, pau <<= 1) ;	/* Get from table */
          }
          n_clst = sz_vol / pau;	/* Number of clusters */
          sz_fat = (n_clst * 4 + 8 + ss - 1) / ss;	/* FAT size [sector] */
          sz_rsv = 32;	/* Number of reserved sectors */
          sz_dir = 0;		/* No static directory */
          if (n_clst <= MAX_FAT16 || n_clst > MAX_FAT32) LEAVE_MKFS(FR_MKFS_ABORTED);
        } else {				/* FAT volume */
          if (pau == 0) {	/* au auto-selection */
            n = sz_vol / 0x1000;	/* Volume size in unit of 4KS */
            for (i = 0, pau = 1; cst[i] && cst[i] <= n; i++, pau <<= 1) ;	/* Get from table */
          }
          n_clst = sz_vol / pau;
          if (n_clst > MAX_FAT12) {
            n = n_clst * 2 + 4;		/* FAT size [byte] */
          } else {
            fmt = FS_FAT12;
            n = (n_clst * 3 + 1) / 2 + 3;	/* FAT size [byte] */
          }
          sz_fat = (n + ss - 1) / ss;		/* FAT size [sector] */
          sz_rsv = 1;						/* Number of reserved sectors */
          sz_dir = (DWORD)n_rootdir * SZDIRE / ss;	/* Rootdir size [sector] */
        }
        b_fat = b_vol + sz_rsv;						/* FAT base */
        b_data = b_fat + sz_fat * n_fats + sz_dir;	/* Data base */
        
        /* Align data base to erase block boundary (for flash memory media) */
        n = ((b_data + sz_blk - 1) & ~(sz_blk - 1)) - b_data;	/* Next nearest erase block from current data base */
        if (fmt == FS_FAT32) {		/* FAT32: Move FAT base */
          sz_rsv += n; b_fat += n;
        } else {					/* FAT: Expand FAT size */
          sz_fat += n / n_fats;
        }
        
        /* Determine number of clusters and final check of validity of the FAT sub-type */
        if (sz_vol < b_data + pau * 16 - b_vol) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too small volume */
        n_clst = (sz_vol - sz_rsv - sz_fat * n_fats - sz_dir) / pau;
        if (fmt == FS_FAT32) {
          if (n_clst <= MAX_FAT16) {	/* Too few clusters for FAT32 */
            if (au == 0 && (au = pau / 2) != 0) continue;	/* Adjust cluster size and retry */
            LEAVE_MKFS(FR_MKFS_ABORTED);
          }
        }
        if (fmt == FS_FAT16) {
          if (n_clst > MAX_FAT16) {	/* Too many clusters for FAT16 */
            if (au == 0 && (pau * 2) <= 64) {
              au = pau * 2; continue;		/* Adjust cluster size and retry */
            }
            if ((opt & FM_FAT32)) {
              fmt = FS_FAT32; continue;	/* Switch type to FAT32 and retry */
            }
            if (au == 0 && (au = pau * 2) <= 128) continue;	/* Adjust cluster size and retry */
            LEAVE_MKFS(FR_MKFS_ABORTED);
          }
          if  (n_clst <= MAX_FAT12) {	/* Too few clusters for FAT16 */
            if (au == 0 && (au = pau * 2) <= 128) continue;	/* Adjust cluster size and retry */
            LEAVE_MKFS(FR_MKFS_ABORTED);
          }
        }
        if (fmt == FS_FAT12 && n_clst > MAX_FAT12) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too many clusters for FAT12 */
        
        /* Ok, it is the valid cluster configuration */
        break;
      } while (1);
      
#if FF_USE_TRIM
      tbl[0] = b_vol; tbl[1] = b_vol + sz_vol - 1;	/* Inform the device the volume area can be erased */
      disk_ioctl(pdrv, CTRL_TRIM, tbl);
#endif
      /* Create FAT VBR */
      mem_set(buf, 0, ss);
      mem_cpy(buf + BS_JmpBoot, "\xEB\xFE\x90" "MSDOS5.0", 11);/* Boot jump code (x86), OEM name */
      st_word(buf + BPB_BytsPerSec, ss);				/* Sector size [byte] */
      buf[BPB_SecPerClus] = (BYTE)pau;				/* Cluster size [sector] */
      st_word(buf + BPB_RsvdSecCnt, (WORD)sz_rsv);	/* Size of reserved area */
      buf[BPB_NumFATs] = (BYTE)n_fats;				/* Number of FATs */
      st_word(buf + BPB_RootEntCnt, (WORD)((fmt == FS_FAT32) ? 0 : n_rootdir));	/* Number of root directory entries */
      if (sz_vol < 0x10000) {
        st_word(buf + BPB_TotSec16, (WORD)sz_vol);	/* Volume size in 16-bit LBA */
      } else {
        st_dword(buf + BPB_TotSec32, sz_vol);		/* Volume size in 32-bit LBA */
      }
      buf[BPB_Media] = 0xF8;							/* Media descriptor byte */
      st_word(buf + BPB_SecPerTrk, 63);				/* Number of sectors per track (for int13) */
      st_word(buf + BPB_NumHeads, 255);				/* Number of heads (for int13) */
      st_dword(buf + BPB_HiddSec, b_vol);				/* Volume offset in the physical drive [sector] */
      if (fmt == FS_FAT32) {
        st_dword(buf + BS_VolID32, GET_FATTIME());	/* VSN */
        st_dword(buf + BPB_FATSz32, sz_fat);		/* FAT size [sector] */
        st_dword(buf + BPB_RootClus32, 2);			/* Root directory cluster # (2) */
        st_word(buf + BPB_FSInfo32, 1);				/* Offset of FSINFO sector (VBR + 1) */
        st_word(buf + BPB_BkBootSec32, 6);			/* Offset of backup VBR (VBR + 6) */
        buf[BS_DrvNum32] = 0x80;					/* Drive number (for int13) */
        buf[BS_BootSig32] = 0x29;					/* Extended boot signature */
        mem_cpy(buf + BS_VolLab32, "NO NAME    " "FAT32   ", 19);	/* Volume label, FAT signature */
      } else {
        st_dword(buf + BS_VolID, GET_FATTIME());	/* VSN */
        st_word(buf + BPB_FATSz16, (WORD)sz_fat);	/* FAT size [sector] */
        buf[BS_DrvNum] = 0x80;						/* Drive number (for int13) */
        buf[BS_BootSig] = 0x29;						/* Extended boot signature */
        mem_cpy(buf + BS_VolLab, "NO NAME    " "FAT     ", 19);	/* Volume label, FAT signature */
      }
      st_word(buf + BS_55AA, 0xAA55);					/* Signature (offset is fixed here regardless of sector size) */
      if (disk_write(pdrv, buf, b_vol, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Write it to the VBR sector */
      
      /* Create FSINFO record if needed */
      if (fmt == FS_FAT32) {
        disk_write(pdrv, buf, b_vol + 6, 1);		/* Write backup VBR (VBR + 6) */
        mem_set(buf, 0, ss);
        st_dword(buf + FSI_LeadSig, 0x41615252);
        st_dword(buf + FSI_StrucSig, 0x61417272);
        st_dword(buf + FSI_Free_Count, n_clst - 1);	/* Number of free clusters */
        st_dword(buf + FSI_Nxt_Free, 2);			/* Last allocated cluster# */
        st_word(buf + BS_55AA, 0xAA55);
        disk_write(pdrv, buf, b_vol + 7, 1);		/* Write backup FSINFO (VBR + 7) */
        disk_write(pdrv, buf, b_vol + 1, 1);		/* Write original FSINFO (VBR + 1) */
      }
      
      /* Initialize FAT area */
      mem_set(buf, 0, (UINT)szb_buf);
      sect = b_fat;		/* FAT start sector */
      for (i = 0; i < n_fats; i++) {			/* Initialize FATs each */
        if (fmt == FS_FAT32) {
          st_dword(buf + 0, 0xFFFFFFF8);	/* Entry 0 */
          st_dword(buf + 4, 0xFFFFFFFF);	/* Entry 1 */
          st_dword(buf + 8, 0x0FFFFFFF);	/* Entry 2 (root directory) */
        } else {
          st_dword(buf + 0, (fmt == FS_FAT12) ? 0xFFFFF8 : 0xFFFFFFF8);	/* Entry 0 and 1 */
        }
        nsect = sz_fat;		/* Number of FAT sectors */
        do {	/* Fill FAT sectors */
          n = (nsect > sz_buf) ? sz_buf : nsect;
          if (disk_write(pdrv, buf, sect, (UINT)n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
          mem_set(buf, 0, ss);
          sect += n; nsect -= n;
        } while (nsect);
      }
      
      /* Initialize root directory (fill with zero) */
      nsect = (fmt == FS_FAT32) ? pau : sz_dir;	/* Number of root directory sectors */
      do {
        n = (nsect > sz_buf) ? sz_buf : nsect;
        if (disk_write(pdrv, buf, sect, (UINT)n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
        sect += n; nsect -= n;
      } while (nsect);
    }
    
    /* Determine system ID in the partition table */
    if (FF_FS_EXFAT && fmt == FS_EXFAT) {
      sys = 0x07;			/* HPFS/NTFS/exFAT */
    } else {
      if (fmt == FS_FAT32) {
        sys = 0x0C;		/* FAT32X */
      } else {
        if (sz_vol >= 0x10000) {
          sys = 0x06;	/* FAT12/16 (large) */
        } else {
          sys = (fmt == FS_FAT16) ? 0x04 : 0x01;	/* FAT16 : FAT12 */
        }
      }
    }
    
    /* Update partition information */
    if (FF_MULTI_PARTITION && part != 0) {	/* Created in the existing partition */
      /* Update system ID in the partition table */
      if (disk_read(pdrv, buf, 0, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Read the MBR */
      buf[MBR_Table + (part - 1) * SZ_PTE + PTE_System] = sys;		/* Set system ID */
      if (disk_write(pdrv, buf, 0, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Write it back to the MBR */
    } else {								/* Created as a new single partition */
      if (!(opt & FM_SFD)) {	/* Create partition table if in FDISK format */
        mem_set(buf, 0, ss);
        st_word(buf + BS_55AA, 0xAA55);		/* MBR signature */
        pte = buf + MBR_Table;				/* Create partition table for single partition in the drive */
        pte[PTE_Boot] = 0;					/* Boot indicator */
        pte[PTE_StHead] = 1;				/* Start head */
        pte[PTE_StSec] = 1;					/* Start sector */
        pte[PTE_StCyl] = 0;					/* Start cylinder */
        pte[PTE_System] = sys;				/* System type */
        n = (b_vol + sz_vol) / (63 * 255);	/* (End CHS may be invalid) */
        pte[PTE_EdHead] = 254;				/* End head */
        pte[PTE_EdSec] = (BYTE)(((n >> 2) & 0xC0) | 63);	/* End sector */
        pte[PTE_EdCyl] = (BYTE)n;			/* End cylinder */
        st_dword(pte + PTE_StLba, b_vol);	/* Start offset in LBA */
        st_dword(pte + PTE_SizLba, sz_vol);	/* Size in sectors */
        if (disk_write(pdrv, buf, 0, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Write it to the MBR */
      }
    }
    
    if (disk_ioctl(pdrv, CTRL_SYNC, 0) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
    
    LEAVE_MKFS(FR_OK);
  }
  
  
  
#if FF_MULTI_PARTITION
  /*-----------------------------------------------------------------------*/
  /* Create Partition Table on the Physical Drive                          */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_fdisk (
                   BYTE pdrv,			/* Physical drive number */
                   const DWORD* szt,	/* Pointer to the size table for each partitions */
                   void* work			/* Pointer to the working buffer (null: use heap memory) */
                     )
  {
    UINT i, n, sz_cyl, tot_cyl, b_cyl, e_cyl, p_cyl;
    BYTE s_hd, e_hd, *p, *buf = (BYTE*)work;
    DSTATUS stat;
    DWORD sz_disk, sz_part, s_part;
    FRESULT res;
    
    
    stat = disk_initialize(pdrv);
    if (stat & STA_NOINIT) return FR_NOT_READY;
    if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
    if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_disk)) return FR_DISK_ERR;
    
    buf = (BYTE*)work;
#if FF_USE_LFN == 3
    if (!buf) buf = ff_memalloc(FF_MAX_SS);	/* Use heap memory for working buffer */
#endif
    if (!buf) return FR_NOT_ENOUGH_CORE;
    
    /* Determine the CHS without any consideration of the drive geometry */
    for (n = 16; n < 256 && sz_disk / n / 63 > 1024; n *= 2) ;
    if (n == 256) n--;
    e_hd = n - 1;
    sz_cyl = 63 * n;
    tot_cyl = sz_disk / sz_cyl;
    
    /* Create partition table */
    mem_set(buf, 0, FF_MAX_SS);
    p = buf + MBR_Table; b_cyl = 0;
    for (i = 0; i < 4; i++, p += SZ_PTE) {
      p_cyl = (szt[i] <= 100U) ? (DWORD)tot_cyl * szt[i] / 100 : szt[i] / sz_cyl;	/* Number of cylinders */
      if (p_cyl == 0) continue;
      s_part = (DWORD)sz_cyl * b_cyl;
      sz_part = (DWORD)sz_cyl * p_cyl;
      if (i == 0) {	/* Exclude first track of cylinder 0 */
        s_hd = 1;
        s_part += 63; sz_part -= 63;
      } else {
        s_hd = 0;
      }
      e_cyl = b_cyl + p_cyl - 1;	/* End cylinder */
      if (e_cyl >= tot_cyl) LEAVE_MKFS(FR_INVALID_PARAMETER);
      
      /* Set partition table */
      p[1] = s_hd;						/* Start head */
      p[2] = (BYTE)(((b_cyl >> 2) & 0xC0) | 1);	/* Start sector */
      p[3] = (BYTE)b_cyl;					/* Start cylinder */
      p[4] = 0x07;						/* System type (temporary setting) */
      p[5] = e_hd;						/* End head */
      p[6] = (BYTE)(((e_cyl >> 2) & 0xC0) | 63);	/* End sector */
      p[7] = (BYTE)e_cyl;					/* End cylinder */
      st_dword(p + 8, s_part);			/* Start sector in LBA */
      st_dword(p + 12, sz_part);			/* Number of sectors */
      
      /* Next partition */
      b_cyl += p_cyl;
    }
    st_word(p, 0xAA55);		/* MBR signature (always at offset 510) */
    
    /* Write it to the MBR */
    res = (disk_write(pdrv, buf, 0, 1) == RES_OK && disk_ioctl(pdrv, CTRL_SYNC, 0) == RES_OK) ? FR_OK : FR_DISK_ERR;
    LEAVE_MKFS(res);
  }
  
#endif /* FF_MULTI_PARTITION */
#endif /* FF_USE_MKFS && !FF_FS_READONLY */
  
  
  
  
#if FF_USE_STRFUNC
#if FF_USE_LFN && FF_LFN_UNICODE && (FF_STRF_ENCODE < 0 || FF_STRF_ENCODE > 3)
#error Wrong FF_STRF_ENCODE setting
#endif
  /*-----------------------------------------------------------------------*/
  /* Get a String from the File                                            */
  /*-----------------------------------------------------------------------*/
  
  TCHAR* f_gets (
                 TCHAR* buff,	/* Pointer to the string buffer to read */
                 int len,		/* Size of string buffer (items) */
                 FIL* fp			/* Pointer to the file object */
                   )
  {
    int nc = 0;
    TCHAR *p = buff;
    BYTE s[2];
    UINT rc;
    WCHAR wc;
#if FF_USE_LFN && ((FF_LFN_UNICODE == 1 && FF_STRF_ENCODE == 3) || (FF_LFN_UNICODE == 2 && FF_STRF_ENCODE != 3))
    DWORD dc;
#endif
#if FF_USE_LFN && FF_LFN_UNICODE == 1 && FF_STRF_ENCODE == 3
    UINT ct;
#endif
    
#if FF_USE_LFN && FF_LFN_UNICODE == 1	/* UTF-16 output */
#if FF_STRF_ENCODE == 0		/* Read a character in ANSI/OEM */
    while (nc < len - 1) {
      f_read(fp, s, 1, &rc);
      if (rc != 1) break;
      wc = s[0];
      if (dbc_1st((BYTE)wc)) {
        f_read(fp, s, 1, &rc);
        if (rc != 1 || !dbc_2nd(s[0])) continue;
        wc = wc << 8 | s[0];
      }
      wc = ff_oem2uni(wc, CODEPAGE);
      if (wc == 0) continue;
#elif FF_STRF_ENCODE == 1 || FF_STRF_ENCODE == 2	/* Read a character in UTF-16LE/BE */
      while (nc < len - 1) {
        f_read(fp, s, 2, &rc);
        if (rc != 2) break;
        wc = (FF_STRF_ENCODE == 1) ? s[1] << 8 | s[0] : s[0] << 8 | s[1];
#elif FF_STRF_ENCODE == 3		/* Read a character in UTF-8 */
	while (nc < len - 2) {
          f_read(fp, s, 1, &rc);
          if (rc != 1) break;
          dc = s[0];
          if (dc >= 0x80) {
            ct = 0;
            if ((dc & 0xE0) == 0xC0) { dc &= 0x1F; ct = 1; }
            if ((dc & 0xF0) == 0xE0) { dc &= 0x0F; ct = 2; }
            if ((dc & 0xF8) == 0xF0) { dc &= 0x07; ct = 3; }
            if (ct == 0) continue;
            do {
              f_read(fp, s, 1, &rc);
              if (rc != 1 || (s[0] & 0xC0) != 0x80) break;
              dc = dc << 6 | (s[0] & 0x3F);
            } while (--ct);
            if (ct || dc < 0x80 || dc >= 0x110000) continue;
          }
          if (dc >= 0x10000) {
            wc = (WCHAR)(0xD800 | ((dc >> 10) - 0x40));
            *p++ = wc; nc++;
            wc = (WCHAR)(0xDC00 | (dc & 0x3FF));
          } else {
            wc = (WCHAR)dc;
          }
#endif
          /* Output it in UTF-16 encoding */
          if (FF_USE_STRFUNC == 2 && wc == '\r') continue;
          *p++ = wc; nc++;
          if (wc == '\n') break;
	}
        
#elif FF_USE_LFN && FF_LFN_UNICODE == 2	&& FF_STRF_ENCODE != 3	/* UTF-8 output */
	while (nc < len - 4) {
#if FF_STRF_ENCODE == 0		/* Read a character in ANSI/OEM */
          f_read(fp, s, 1, &rc);
          if (rc != 1) break;
          wc = s[0];
          if (dbc_1st((BYTE)wc)) {
            f_read(fp, s, 1, &rc);
            if (rc != 1 || !dbc_2nd(s[0])) continue;
            wc = wc << 8 | s[0];
          }
          dc = ff_oem2uni(wc, CODEPAGE);
          if (dc == 0) continue;
#else 						/* Read a character in UTF-16LE/BE */
          f_read(fp, s, 2, &rc);
          if (rc != 2) break;
          dc = (FF_STRF_ENCODE == 1) ? s[1] << 8 | s[0] : s[0] << 8 | s[1];
          if (IsSurrogate(dc)) {
            f_read(fp, s, 2, &rc);
            if (rc != 2) break;
            wc = (FF_STRF_ENCODE == 1) ? s[1] << 8 | s[0] : s[0] << 8 | s[1];
            if (!IsSurrogateH(dc) || !IsSurrogateL(wc)) continue;
            dc = ((dc & 0x3FF) + 0x40) << 10 | (wc & 0x3FF);
          }
#endif
          /* Output it in UTF-8 encoding */
          if (FF_USE_STRFUNC == 2 && dc == '\r') continue;
          if (dc < 0x80) {	/* 1-byte */
            *p++ = (TCHAR)dc;
            nc++;
            if (dc == '\n') break;
          } else {
            if (dc < 0x800) {	/* 2-byte */
              *p++ = (TCHAR)(0xC0 | (dc >> 6 & 0x1F));
              *p++ = (TCHAR)(0x80 | (dc >> 0 & 0x3F));
              nc += 2;
            } else {
              if (dc < 0x10000) {	/* 3-byte */
                *p++ = (TCHAR)(0xE0 | (dc >> 12 & 0x0F));
                *p++ = (TCHAR)(0x80 | (dc >> 6 & 0x3F));
                *p++ = (TCHAR)(0x80 | (dc >> 0 & 0x3F));
                nc += 3;
              } else {			/* 4-byte */
                *p++ = (TCHAR)(0xF0 | (dc >> 18 & 0x07));
                *p++ = (TCHAR)(0x80 | (dc >> 12 & 0x3F));
                *p++ = (TCHAR)(0x80 | (dc >> 6 & 0x3F));
                *p++ = (TCHAR)(0x80 | (dc >> 0 & 0x3F));
                nc += 4;
              }
            }
          }
	}
        
#else								/* Byte-by-byte without any conversion (ANSI/OEM API or UTF-8 to UTF-8) */
	while (nc < len - 1) {
          f_read(fp, s, 1, &rc);
          if (rc != 1) break;
          wc = s[0];
          if (FF_USE_STRFUNC == 2 && wc == '\r') continue;
          *p++ = (TCHAR)wc; nc++;
          if (wc == '\n') break;
	}
#endif
        
	*p = 0;
	return nc ? buff : 0;			/* When no data read (EOF or error), return with error. */
      }
      
      
      
      
#if !FF_FS_READONLY
#include <stdarg.h>
      /*-----------------------------------------------------------------------*/
      /* Put a Character to the File                                           */
      /*-----------------------------------------------------------------------*/
      
      typedef struct {	/* Putchar output buffer and work area */
	FIL *fp;		/* Ptr to the writing file */
	int idx, nchr;	/* Write index of buf[] (-1:error), number of encoding units written */
#if FF_USE_LFN && FF_LFN_UNICODE == 1
	WCHAR hs;
#elif FF_USE_LFN && FF_LFN_UNICODE == 2
	BYTE bs[4];
	UINT wi, ct;
#endif
	BYTE buf[64];	/* Write buffer */
      } putbuff;
      
      
      static
        void putc_bfd (		/* Buffered write with code conversion */
                       putbuff* pb,
                       TCHAR c
                         )
        {
          UINT n;
          int i, nc;
#if FF_USE_LFN && (FF_LFN_UNICODE == 1 || (FF_LFN_UNICODE == 2 && (FF_STRF_ENCODE != 3)))
          WCHAR hs, wc;
#endif
#if FF_USE_LFN && FF_LFN_UNICODE == 2 && FF_STRF_ENCODE != 3
          DWORD dc;
          TCHAR *tp;
#endif
          
          if (FF_USE_STRFUNC == 2 && c == '\n') {	 /* LF -> CRLF conversion */
            putc_bfd(pb, '\r');
          }
          
          i = pb->idx;			/* Write index of pb->buf[] */
          if (i < 0) return;
          nc = pb->nchr;			/* Write unit count */
          
#if FF_USE_LFN && FF_LFN_UNICODE >= 1
#if FF_USE_LFN && FF_LFN_UNICODE == 1	/* UTF-16 input */
          if (IsSurrogateH(c)) {
            pb->hs = c; return;
          }
          wc = c; hs = pb->hs; pb->hs = 0;
          if (hs != 0) {
            if (!IsSurrogateL(wc)) hs = 0;
          } else {
            if (IsSurrogateL(wc)) return;
          }
#if FF_STRF_ENCODE == 3			/* Write it in UTF-8 */
          if (hs != 0) {				/* 4-byte */
            nc += 4;
            hs = (hs & 0x3FF) + 0x40;
            pb->buf[i++] = (BYTE)(0xF0 | hs >> 8);
            pb->buf[i++] = (BYTE)(0x80 | (hs >> 2 & 0x3F));
            pb->buf[i++] = (BYTE)(0x80 | (hs & 3) << 4 | (wc >> 6 & 0x0F));
            pb->buf[i++] = (BYTE)(0x80 | (wc & 0x3F));
          } else {
            if (wc < 0x80) {		/* 1-byte */
              nc++;
              pb->buf[i++] = (BYTE)wc;
            } else {
              if (wc < 0x800) {	/* 2-byte */
                nc += 2;
                pb->buf[i++] = (BYTE)(0xC0 | wc >> 6);
              } else {			/* 3-byte */
                nc += 3;
                pb->buf[i++] = (BYTE)(0xE0 | wc >> 12);
                pb->buf[i++] = (BYTE)(0x80 | (wc >> 6 & 0x3F));
              }
              pb->buf[i++] = (BYTE)(0x80 | (wc & 0x3F));
            }
          }
#endif
#else									/* UTF-8 input */
          for (;;) {
            if (pb->ct == 0) {	/* Out of multi-byte sequence? */
              pb->bs[pb->wi = 0] = (BYTE)c;	/* Save 1st byte */
              if ((BYTE)c < 0x80) break;					/* 1-byte? */
              if (((BYTE)c & 0xE0) == 0xC0) pb->ct = 1;	/* 2-byte? */
              if (((BYTE)c & 0xF0) == 0xE0) pb->ct = 2;	/* 3-byte? */
              if (((BYTE)c & 0xF1) == 0xF0) pb->ct = 3;	/* 4-byte? */
              return;
            } else {			/* In the multi-byte sequence */
              if (((BYTE)c & 0xC0) != 0x80) {	/* Broken sequence? */
                pb->ct = 0; continue;
              }
              pb->bs[++pb->wi] = (BYTE)c;	/* Save the trailing byte */
              if (--pb->ct == 0) break;	/* End of sequence? */
              return;
            }
          }
#if FF_STRF_ENCODE == 3		/* Write it in UTF-8 */
          pb->buf[i++] = pb->bs[0]; nc++;
          if (pb->bs[0] >= 0xC0) {
            pb->buf[i++] = pb->bs[1]; nc++;
          }
          if (pb->bs[0] >= 0xE0) {
            pb->buf[i++] = pb->bs[2]; nc++;
          }
          if (pb->bs[0] >= 0xF0) {
            pb->buf[i++] = pb->bs[3]; nc++;
          }
#else						/* Write it in UTF-16 or ANSI/OEM */
          tp = (TCHAR*)pb->bs;
          dc = tchar2uni(&tp);	/* UTF-8 ==> UTF-16 */
          if (dc == 0xFFFFFFFF) return;
          wc = (WCHAR)dc;
          hs = (WCHAR)(dc >> 16);
#endif
#endif
#if FF_USE_LFN && FF_LFN_UNICODE >= 1 && FF_STRF_ENCODE != 3
#if FF_STRF_ENCODE == 2			/* Write a character in UTF-16BE */
          if (hs != 0) {
            pb->buf[i++] = (BYTE)(hs >> 8);
            pb->buf[i++] = (BYTE)hs;
            nc++;
          }
          pb->buf[i++] = (BYTE)(wc >> 8);
          pb->buf[i++] = (BYTE)wc;
          nc++;
#elif FF_STRF_ENCODE == 1		/* Write a character in UTF-16LE */
          if (hs != 0) {
            pb->buf[i++] = (BYTE)hs;
            pb->buf[i++] = (BYTE)(hs >> 8);
            nc++;
          }
          pb->buf[i++] = (BYTE)wc;
          pb->buf[i++] = (BYTE)(wc >> 8);
          nc++;
#else							/* Write a character in ANSI/OEM */
          if (hs != 0) return;
          wc = ff_uni2oem(wc, CODEPAGE);	/* UTF-16 ==> ANSI/OEM */
          if (wc == 0) return;;
          if (wc >= 0x100) {
            pb->buf[i++] = (BYTE)(wc >> 8); nc++;
          }
          pb->buf[i++] = (BYTE)wc; nc++;
#endif
#endif
          
#else									/* ANSI/OEM input */
          pb->buf[i++] = (BYTE)c;
          nc++;
#endif
          
          if (i >= (int)(sizeof pb->buf) - 4) {	/* Write buffered characters to the file */
            f_write(pb->fp, pb->buf, (UINT)i, &n);
            i = (n == (UINT)i) ? 0 : -1;
          }
          pb->idx = i;
          pb->nchr = nc;
        }
      
      
      static
        int putc_flush (		/* Flush left characters in the buffer */
                        putbuff* pb
                          )
        {
          UINT nw;
          
          if (   pb->idx >= 0	/* Flush buffered characters to the file */
              && f_write(pb->fp, pb->buf, (UINT)pb->idx, &nw) == FR_OK
		&& (UINT)pb->idx == nw) return pb->nchr;
          return EOF;
        }
      
      
      static
        void putc_init (		/* Initialize write buffer */
                        putbuff* pb,
                        FIL* fp
                          )
        {
          mem_set(pb, 0, sizeof (putbuff));
          pb->fp = fp;
        }
      
      
      
      int f_putc (
                  TCHAR c,	/* A character to be output */
                  FIL* fp		/* Pointer to the file object */
                    )
      {
	putbuff pb;
        
        
	putc_init(&pb, fp);
	putc_bfd(&pb, c);	/* Put the character */
	return putc_flush(&pb);
      }
      
      
      
      
      /*-----------------------------------------------------------------------*/
      /* Put a String to the File                                              */
      /*-----------------------------------------------------------------------*/
      
      int f_puts (
                  const TCHAR* str,	/* Pointer to the string to be output */
                  FIL* fp				/* Pointer to the file object */
                    )
      {
	putbuff pb;
        
        
	putc_init(&pb, fp);
	while (*str) putc_bfd(&pb, *str++);		/* Put the string */
	return putc_flush(&pb);
      }
      
      
      
      
      /*-----------------------------------------------------------------------*/
      /* Put a Formatted String to the File                                    */
      /*-----------------------------------------------------------------------*/
      
      int f_printf (
                    FIL* fp,			/* Pointer to the file object */
                    const TCHAR* fmt,	/* Pointer to the format string */
                    ...					/* Optional arguments... */
                      )
      {
	va_list arp;
	putbuff pb;
	BYTE f, r;
	UINT i, j, w;
	DWORD v;
	TCHAR c, d, str[32], *p;
        
        
	putc_init(&pb, fp);
        
	va_start(arp, fmt);
        
	for (;;) {
          c = *fmt++;
          if (c == 0) break;			/* End of string */
          if (c != '%') {				/* Non escape character */
            putc_bfd(&pb, c);
            continue;
          }
          w = f = 0;
          c = *fmt++;
          if (c == '0') {				/* Flag: '0' padding */
            f = 1; c = *fmt++;
          } else {
            if (c == '-') {			/* Flag: left justified */
              f = 2; c = *fmt++;
            }
          }
          if (c == '*') {				/* Minimum width by argument */
            w = va_arg(arp, int);
            c = *fmt++;
          } else {
            while (IsDigit(c)) {	/* Minimum width */
              w = w * 10 + c - '0';
              c = *fmt++;
            }
          }
          if (c == 'l' || c == 'L') {	/* Type prefix: Size is long int */
            f |= 4; c = *fmt++;
          }
          if (c == 0) break;
          d = c;
          if (IsLower(d)) d -= 0x20;
          switch (d) {				/* Atgument type is... */
          case 'S' :					/* String */
            p = va_arg(arp, TCHAR*);
            for (j = 0; p[j]; j++) ;
            if (!(f & 2)) {						/* Right padded */
              while (j++ < w) putc_bfd(&pb, ' ') ;
            }
            while (*p) putc_bfd(&pb, *p++) ;		/* String body */
            while (j++ < w) putc_bfd(&pb, ' ') ;	/* Left padded */
            continue;
            
          case 'C' :					/* Character */
            putc_bfd(&pb, (TCHAR)va_arg(arp, int)); continue;
            
          case 'B' :					/* Unsigned binary */
            r = 2; break;
            
          case 'O' :					/* Unsigned octal */
            r = 8; break;
            
          case 'D' :					/* Signed decimal */
          case 'U' :					/* Unsigned decimal */
            r = 10; break;
            
          case 'X' :					/* Unsigned hexdecimal */
            r = 16; break;
            
          default:					/* Unknown type (pass-through) */
            putc_bfd(&pb, c); continue;
          }
          
          /* Get an argument and put it in numeral */
          v = (f & 4) ? (DWORD)va_arg(arp, long) : ((d == 'D') ? (DWORD)(long)va_arg(arp, int) : (DWORD)va_arg(arp, unsigned int));
          if (d == 'D' && (v & 0x80000000)) {
            v = 0 - v;
            f |= 8;
          }
          i = 0;
          do {
            d = (TCHAR)(v % r); v /= r;
            if (d > 9) d += (c == 'x') ? 0x27 : 0x07;
            str[i++] = d + '0';
          } while (v && i < sizeof str / sizeof *str);
          if (f & 8) str[i++] = '-';
          j = i; d = (f & 1) ? '0' : ' ';
          if (!(f & 2)) {
            while (j++ < w) putc_bfd(&pb, d);	/* Right pad */
          }
          do {
            putc_bfd(&pb, str[--i]);			/* Number body */
          } while (i);
          while (j++ < w) putc_bfd(&pb, d);		/* Left pad */
	}
        
	va_end(arp);
        
	return putc_flush(&pb);
      }
      
#endif /* !FF_FS_READONLY */
#endif /* FF_USE_STRFUNC */
      
      
      
#if FF_CODE_PAGE == 0
      /*-----------------------------------------------------------------------*/
      /* Set Active Codepage for the Path Name                                 */
      /*-----------------------------------------------------------------------*/
      
      FRESULT f_setcp (
                       WORD cp		/* Value to be set as active code page */
                         )
      {
	static const WORD       validcp[] = {  437,   720,   737,   771,   775,   850,   852,   857,   860,   861,   862,   863,   864,   865,   866,   869,   932,   936,   949,   950, 0};
	static const BYTE *const tables[] = {Ct437, Ct720, Ct737, Ct771, Ct775, Ct850, Ct852, Ct857, Ct860, Ct861, Ct862, Ct863, Ct864, Ct865, Ct866, Ct869, Dc932, Dc936, Dc949, Dc950, 0};
	UINT i;
        
        
	for (i = 0; validcp[i] != 0 && validcp[i] != cp; i++) ;	/* Find the code page */
	if (validcp[i] != cp) return FR_INVALID_PARAMETER;	/* Not found? */
        
	CodePage = cp;
	if (cp >= 900) {	/* DBCS */
          ExCvt = 0;
          DbcTbl = tables[i];
	} else {			/* SBCS */
          ExCvt = tables[i];
          DbcTbl = 0;
	}
	return FR_OK;
      }
#endif	/* FF_CODE_PAGE == 0 */
      
      